Pico Island

Pico Island (Ilha do Pico, Portuguese pronunciation: [ˈiʎɐ du ˈpiku]), is an island in the Central Group of the Portuguese Azores. The landscape features an eponymous volcano, Ponta do Pico, which is the highest mountain in Portugal, the Azores, and the highest elevation of the Mid-Atlantic Ridge. In the tradition of the Portuguese poet, Raul Brandão, Pico is referred to as the Ilha Preta ("Black Island"), for its black volcanic soils, which nourish its UNESCO-designated vineyards that once allowed the development of the island's economy. Pico is the second largest and, geologically speaking, the most recently formed island of the Azores, being around 300,000 years old.[3]

Pico Island
Native name:
Ilha do Pico
Nickname: The Black Island
Madalena do Pico - panoramio (8).jpg
The island of Pico, as seen from the north-west coast in the outskirts of Madalena with vineyards and Mount Pico in the background
Location of the island of Pico in the archipelago of the Azores
LocationAtlantic Ocean
Coordinates38°27′57″N 28°20′0″W / 38.46583°N 28.33333°W / 38.46583; -28.33333Coordinates: 38°27′57″N 28°20′0″W / 38.46583°N 28.33333°W / 38.46583; -28.33333
Area444.97 km2 (171.80 sq mi)[1]
Coastline151.84 km (94.349 mi)[1]
Highest elevation2,351 m (7713 ft)[1]
Highest pointMount Pico
Autonomous RegionAzores
Population13,645 (2019)[2]
Pop. density30.66/km2 (79.41/sq mi)
Ethnic groupsPortuguese
Additional information
Time zone


A traditional windmill along the coast of Monte, in the municipality of Madalena
Convent of São Pedro de Alcântara, a 17th-century building
Radar image of Pico Island next to Faial and São Jorge islands

The exact date of the island's discovery is not known, however, in the 1375 Catalan Atlas, Pico is depicted along several other islands of the Azores, where it is labelled as li colunbj. In Cristoforo Soligo's map from 1475, Pico is described both as Dom Diniz (or São Diniz) island and as Insula Columbi.[4]

Although the Azores were inhabited since 1439, settlement on Pico only started in the 1480s when Pico became part of the neighboring island of Faial's control. Pico is thought to be the last of the islands of the Central Group to be occupied.[5]

In a letter dated March 28, 1481, the administrator of the Azores, D. Beatriz, gave the possession of the island of Pico to the first captain of the donatarie, D. Álvaro d'Ornelas, a resident of island of Madeira, on the condition that he populate the island ('Captains', often of noble heritage, obtained land rights in regions not important enough to merit a 'governor', and were a cheap way for the state to settle new territory). d'Ornelas failed to attract settlers, so on December 29, 1482, the Flemish captain of the island of Faial, 7km from Pico, Jós d'Hutra, became the new captain. The transfer of the island of Pico to Jós d'Hutra not only confirms that Pico was not colonized at the end of the 15th century, but also demonstrates the interest in boosting the insular population of the islands of the central group. This was understandable given the growing geo-economic importance of the Azores archipelago at that time, as the Portuguese monarchy was expanding into Morocco and along the west African coast.[6]

Population grew slowly, in pert because of difficulties cultivating wheat. By 1587, there were less than 3,000 inhabitants. Soil quality is conditioned by the volcanic soils [6]consisting mostly of lightly weathered recent basalt (designated as "biscoitos" or "mistérios". Examples include the Mistério de São João, resulting from a 1718 eruption. In addition, there are few rivers on the island compared to other parts of the archipelago. The last eruptions of magma took place in 1718 and 1720 and generated three volcanic cinder cones (Mistérios): Santa Luzia and São João in 1718[7] and Silveira in 1720.[8]

Aside from a few slaves sent to herd sheep in isolation before European settlement, the island's first inhabitants were primarily Portuguese, but of diverse origins.[5][6] Settlers of Portuguese origin arrived from different parts of the metropolis, some passing though Madeira Island or other Azorean islands, particularly Terceira. Some individuals had noble origins, owning land and goods; there were secular and regular clergy, especially the Franciscans; and another group consisted of merchants, craftsmen, farmers and artisans. A small number of Jews came from the beginning of the 16th century, and there were indentured slaves of African origin at this time who farmed and did domestic work. The first municipality in Pico was established at Lajes, where fresh water was available (the place-name (Ribeiras) proves this).

Around 9,000 lived on Pico by 1695. Pico moved "up the ladder" of urban hierarchies from fifth largest centre in the Azores to fourth, behind São Miguel, Terceira and Faial. By the middle of the 18th century the population was over 19,000 people. In 1542, the inhabitants of the north of the island asked King João III to create a second village, to allow better law and order in a frontier economy with theft and corruption. São Roque do Pico was established.[5] It was only much later, when the link between the islands of Pico and Faial strengthened further, that there was a need to create a third municipality. Madalena was established in 1723 (the larger town of Horta is 7km away on Faial, and was where many of the island's property-owners and winemakers lived).[5][6]

The islands of Pico and Faial were administered jointly until 1766, when Pico became an integral part of the Province of the Azores, led by a captain-general based in Angra. Centralizing governance in this way had poor success: in 1836, the people of Pico were integrated into a smaller administrative unit again, the third Azorean district, with the islands of Faial, Flores and Corvo.[6]

The town of Madalena, circa 1848

Settlers initially farmed wheat and some olives in addition to developing a woad industry, as on Faial (based on lichens that were exported to Flanders to produce commercial dyes). The two islands often shared livelihood activities[9] Viticulture, helped by the richer soils found in suitable micro-climates, then grew rapidly. The industry was disturbed by the last volcanic eruptions, but viticulture expanded commercial livelihood opportunities considerably. Pico's famous verdelho wine production, dating back two centuries, was widely appreciated in many countries (including England and in the Americas and even in the palaces of the Russian czars). Viticulture declined with the spread of powdery mildew and phylloxera during the middle of the 19th century, creating a crisis on the island that lasted until the 20th century.[9]

The other major economic activity was whaling. The presence of American and British whalers in the waters of the Azores at the end of the 18th century stabilized the economy. Spermwhale hunting became the primary industry around the island until it was abolished in 1986. The whale factory is now a museum.[10][9]


Physical geographyEdit

Panorama of the westernmost part of the Island, and Faial Island at a distance
View of the stratovolcano near Pico Wine Museum
High altitude area of the island, showing cloud cover adjacent to the summit
The two islets at the entrance to Madalena harbor, formed from a submerged crater

The island is 17.5 km south of São Jorge and just 7 km east of Faial, in the Central Group of islands, an area that is colloquially known as O Triângulo (The Triangle). Pico is 46.3 kilometers long, and at its maximum extent about 16 kilometers wide; making it the second largest of the Azores islands. The 151.8 km coastline is slightly indented with inlets and coves. Accessibility to the sea poses no difficulties, except in sections with plunging, unstable cliffs, subject to frequent landslides (as seen in the northeast and southeast). Seabirds find favorable conditions for nesting in these habitats, in particular the species of Tern (Sterna hirundo and Sterna dougallii) and Shearwater (Calonectris borealis). The rocky substrates prevail throughout the coast (slabs that alternate with rolled pebbles), there are no sandy beaches, but there are numerous tide pools and natural inlets used for bathing.[6]

Along the central plain of volcano cones to the eastern coast, the landscape is pitted with the remnants of craters and lake-filled cones, and dominated by the ancient volcano of Topo. Geomorphologically, the island is composed of three units:[11][12]

  • Topo Volcano - Located on the southernmost side of the island, it corresponds to an ancient shield volcano created by the overlap of various lava flows and destroyed by erosion and landslides;
  • Achada Plateau - Extending from the east side of the island to the stratovolcano, the Achada Plateau is an axial zone comprising spatter and lava cones along a mountainous ridge filled with lake-filled craters, dense scrub and forests. Cones in this region are oriented along a west-northwest and south-southeast axis along a path east to west between the other volcanic structures;
  • Pico Volcano - It occupies the western portion of the island, and corresponds to a central volcano with 2,351 m (7,713 ft) in altitude, created by numerous Hawaiian and Strombolian eruptions. Along its flanks are diverse lava and spatter cones that are formed along radial fractures and faults.

Generally, Pico Island's tectonic structures are oriented along a west-northwest to east-southeast and a northeast to southwest axis. The main axis controls the main structures, especially the main mountain of Pico, while the secondary axises affect the radial fractures and faults along the central plain and eastern volcano.

Similar to the geomorphological structures described above, the volcanic landforms have been identified by Madeira (1998) in the following units:[13]

  • Volcanic Complex of Lajes - pertains to the oldest volcanic structures, comprising volcanoes, lavas and debris that are between 35 and 300,000 thousand years old; it makes up the structures of the eastern part of the island, including the ancient volcano of Topo.
  • Volcanic Complex of Calheta de Nesquim - dating to about 230,000 thousand years ago, this is a fissural zone of cones and basaltic lavas, associated with the Achada Plain, and the many faults along the central plateau of the island.
  • Volcanic Complex of Madalena - the most recent volcanic complex, with both geological and historical eruptions; it includes the basaltic stratovolcano of Pico, but also many of the cones, faults and lava fields that circle the 2,351 meter summit.

The last volcanic eruption (which is debatable) occurred in 1963, in a small submarine eruption off the northwest coast (north of Cachorro in Santa Luzia). Prior to this, major volcanic activity was evident in lava fields generated in only the areas of Prainha (1562–64), Santa Luzia (1718), São João (1718) and Silveira (1720). The paths of the lava flows are still visible; those in the 16th century and 1718 were particularly substantial, extending for over 10 km. Today, the only visible evidence of active volcanism appears on the summit of Pico, in the base and interior of the Piqueninho (the mini-peak on the summit); there are irregular emissions from cracks in this zone. Additionally, there are emissions on the eastern flanks between 1500 and 2000 meters altitude. There have also been found areas of de-gasification along the fault associated with the Lagoa do Capitão and another in the Topo Volcano, as well as a spring rich in CO2 in the area of Silveira.


Pico, much like the other islands, is susceptible to seismic events, although their epicenters have primarily been localized in the Faial-Pico or Pico-São Jorge Channels. Only three significant tectonic earthquakes have hit the island of Pico since the beginning of settlement: The 1757 earthquake, which caused significant damage in the eastern region of the island including the death of 11 people and the collapse of a church and a few houses; the 1973 seismic crisis (October 1973 - May 1974) in which the main earthquake (with magnitude 5.5) did considerable damage to 604 houses in Faial and 2,000 in Pico, which left nearly 5,000 people homeless;[6] and the July 9, 1998 earthquake, the strongest earthquake registered in the last 30 years, which had its epicenter 5 kilometers northeast of Ponta da Ribeirinha, on the island of Faial, reaching a 5.8 magnitude. It was felt on Pico, with a maximum intensity level of VII on the Mercalli scale; some homes were damaged and possessions were buffeted. Other violent earthquakes which have affected the island include: the 1957-58 seismic events associated with the eruption of the Capelinhos volcano (on Faial), the February 1964 earthquake on the island of São Jorge, and the 1926 earthquake, whose epicenter was registered in the Faial-Pico Channel.


Pittosporum undulatum, here depicted on Pico, is the most invasive plant on the island

According to the 2018 land occupation chart of the Azores, compared to the other islands of the archipelago, Pico has, both by proportion and total land area, the largest area of intact native laurisilva forests, and broadleaf forests (which includes introduced species such as Pittosporum undulatum), which occupy, respectively, 2.9% and 30% of the island. Pico is the only island in the Azores where pasture and meadow are not the dominant landscape (accounting only for around 29% of the territory).[14]

Over a third of the Natura 2000 protected areas of the Azores are located on Pico. It has also the largest number of volcanic cavities (lava caves) of anywhere in the archipelago, 86 out of 225.[15]


Azores junipers showing their response to the humid climate in the central reserve of the island, near Lagoa do Capitão (Captain's Lake)

Due to its topographic variation, the island has dramatic temperature and precipitation fluctuations. Temperature decreases significantly with altitude and precipitation generally increases from west to east.

At lower elevations, where most of the population resides, Pico has a humid subtropical climate (Köppen: Cfa; Thornthwaite: B) with very mild, rainy winters and warm, noticeably drier summers, although generally not dry enough to be classified as Mediterranean.[6] It has an average temperature of 17.5–18 °C (63.5–64.4 °F) and around 1,000 to 1,600 mm (39 to 63 in) of precipitation fall each year, though it can reach values as high as 2,000 mm (79 in) on the northeast coast (mainly on São Roque, Prainha and Santo Amaro).[16][17] Because of its high relative humidity (around 80%), summers can feel slightly warmer than they really are.[18][19]

At higher elevations, like the Achada Plateau, temperatures are cooler and precipitation increases, it therefore transitions into a wet oceanic climate (Köppen: Cfb; Thornthwaite: A), average relative humidity stays around 90%.[18][6] Places such as the Caiado and Paul lagoons receive, respectively, 4,698 and 3,357 millimetres (185.0 and 132.2 in)[20] of precipitation each year and Mount Pico is recognized as receiving the largest annual rainfall in Portugal (over 5,000 mm (200 in) per year at the northeastern flanks of the volcano).

As altitude reaches 1,500 metres (4,900 ft) and exceeds the planetary boundary layer, both precipitation and humidity levels decrease reaching the top of the volcano which averages only around 500 millimetres (20 in) of precipitation. Temperatures at the peak of the stratovolcano (2,300 metres (7,500 ft) a.s.l.) average 2 °C (36 °F) and snow can be frequently seen in the cooler months, one of the few places in the archipelago where this phenomenon is possible.[16] The climate at this altitude is now subpolar oceanic (Cfc), transitioning into an alpine climate at the very top.[20]

Pico has registered the highest temperature ever recorded in the Azores, 32.1 °C (89.8 °F) on 7 September 1985 at Pico Airport[21] and although there are no climatic stations at Mount Pico, it is likely that the island has also registered the lowest temperature ever recorded in the archipelago.

Climate data for Pico Airport, Bandeiras, Madalena, Pico Island, Azores
Month Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Year
Average high °C (°F) 16.6
Daily mean °C (°F) 14.5
Average low °C (°F) 12.4
Average rainfall mm (inches) 109.5
Average relative humidity (%) 80 80 80 79 81 81 80 80 80 79 80 81 80
Source 1: climate-data.org[22]
Source 2: IPMA (precipitation),[20] (humidity from the neighboring city of Horta)[23]
Climate data for Cabeço do Teicho, 2017-2021, altitude: ~ 850 m (2,790 ft)
Month Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Year
Record high °C (°F) 18.6
Average high °C (°F) 12.0
Daily mean °C (°F) 10.0
Average low °C (°F) 7.7
Record low °C (°F) 1.6
Average precipitation mm (inches) 636.9
Average relative humidity (%) 90 87 91 91 89 90 88 91 90 92 92 91 90
Source: Direção Regional do Ambiente[24]

Human geographyEdit

Population of
Pico Island
1695 10,028—    
1747 19,748+96.9%
1776 21,061+6.6%
1795 22,310+5.9%
1849 31,000+39.0%
1900 24,500−21.0%
1930 20,500−16.3%
1960 21,837+6.5%
1981 15,483−29.1%
1991 15,202−1.8%
2001 14,806−2.6%
2011 14,148−4.4%
2019 13,645−3.6%

Geological, geomorphological and climatic constraints played (and still have) a determining role in economic activity, in the distribution of urban agglomerations and in demographic evolution. The settlement pattern is a good example of the native's adaptation to the specific physical geography of this island, developing mainly along the coast and along the roads of communication. The main urban centers, municipality seats, are located by the sea: Madalena, São Roque do Pico and Lajes do Pico.[6]

Regarding demographic behavior, the population has continued to decline since the middle of the last century, a trend that continues to the present day. However, the 1960s and 1970s were the decades that showed a more negative population variation rate, due to the intense emigration surge that was generated at this time and that was generalized to the entire archipelago. Unlike other islands in the Azores, in the 1990s the situation did not change, continuing to register a negative population variation (-2.6%), even higher than that registered in the 1980s. According to the XIV General Census of Population (INE, 2002), the population totaled 14,806 inhabitants, which represents a decrease of 396 inhabitants compared to 1991. In 2001, the municipality of Madalena had the largest population (6,136 individuals), followed by Lajes do Pico (5,041 individuals) and São Roque (3,629 individuals). The population density (33.3 inhabitants/km2) was among the lowest in the archipelago and the age structure showed signs of aging, with more than 50% of the population aged between 25 and 64 years, against 30% of young people and about 20% of seniors.[6]

As of 2019, the total population is estimated to be around 13,645 inhabitants.[2]


Whaling was once one of the main industries of Pico

Historically, Pico was largely dependant on Faial for its economic, political and social activities, and it still is to this day, although mitigated by the entrepreneurial dynamics of its population and by the centralities created by the autonomous regime. The close relations with the neighboring island are still established in the maritime routes that cross the channel daily. Fishing is one of the main activities of the primary sector, namely the capture of tuna for the canning industry, which mainly employs female labor in the processing of fish. Dairy farms supply raw material to the various cheese factories, whose product is highly appreciated for its artisanal characteristics (soft paste).[6]

Currently, it is the secondary and tertiary activity sectors that have the greatest dynamism, occupying around 30% and 50% of the active population, respectively, due to the growth in the offer of services and the installation of branches of the regional administration, which generate specialized employment. The employment rate increased in the 1990s, from 35% to 40%, and contrary to the regional average, the unemployment rate remained stable from 1991 to 2001 (3.2%). However, the level of education is low, with most inhabitants having only the 1st cycle of basic education. Note that only 4.3% have higher education, which is lower than the regional average (5.2%). This situation, together with the still significant percentage of working people in the primary sector (20%), favors an unfavorable panorama in terms of professional qualification of the active population.[6]

Like the other islands, tourism is also an emerging activity in Pico, seen as a strategic pillar for diversifying the economic base. The offer of accommodation has progressed, seeking to respond to the needs of an increasingly demanding destination, with five hotel units (hotels, pensions and others) and four for tourism in rural areas (2002). The support services to visitors and the establishments of restaurants, culture, car rental, tourist entertainment, among others, multiply. As the main whaling center in the Azores, economic agents knew how to transform whale watching into a flourishing business, through the reactivation of an ancestral activity with an undeniable heritage of historical and cultural interest (boats, whaling boats, lookouts, former manufacturing industries, etc.). The capture of sperm whales (Physeter macrocephalus) for oil extraction and production of meal for animal feed definitively ceased in the 1980s, due to the replacement of whale-derived products and compliance with international conventions. The first operator of «whale watching» was installed in Lajes do Pico, with around 26 companies linked to nautical activities.[6]

Pico Wine and vine cultureEdit

The typical lava stone walls protecting the vines

The vine culture on Pico Island began in the late 15th century, when the settlement of the island began. The Verdelho vines found ideal conditions to grow and mature in the volcanic soil and dark stone walls (currais). Later, it was exported to many countries in Europe and America, and reached the Russian court table. Years later, wine production is not as important of an economic activity as it used to be, despite trials to improve the varieties and incentives for the restoration of «currais». The vineyards, which mark the island's landscape and ancestral cultural practices, are a UNESCO World Heritage Site since 2004 (see Landscape of the Pico Island Vineyard Culture).[6][28]

Sustainable tourismEdit

In 2012, Pico received the QualityCoast Gold Award for its efforts to become a sustainable tourism destination. Because of this award, Pico has been selected for inclusion in the global atlas for sustainable tourism DestiNet.[29]

Notable peopleEdit

Jose Vieira Alvernaz


See alsoEdit



  1. ^ a b c "Geografia Pico". iaram.azores.gov.pt. Azores Government. Retrieved 11 January 2021.
  2. ^ a b "Average Population Estimates". srea.azores.gov.pt. Retrieved 11 January 2021.
  3. ^ "Formação e principais erupções". azoresgreenmark.com. Retrieved 11 January 2021.
  4. ^ França, Zilda; Forjaz, Victor-Hugo; Ribeiro, Carlos; Vaz, Amélia; Ribeiro, Elvira; Azevedo, Eduardo; Tavares, Jorge; Almeida, Luis (2014). Forjaz, Victor-Hugo (ed.). Pico Island Natural History Handbook. Ponta Delgada: Observatório Vulcanológico e Geotérmico dos Açores. pp. 10–11. ISBN 978-989-8164-16-2.
  5. ^ a b c d "Pico Island Discovery and Settlement". iac-azores.org. Retrieved 11 January 2021.
  6. ^ a b c d e f g h i j k l m n o "Enciclopédia Açoriana". Cultura Açores (in Portuguese). Retrieved 15 June 2021.
  7. ^ "Vulcão do Pico". ivar.azores.gov.pt. Retrieved 11 January 2021.
  8. ^ "Sistema Vulcânico Fissural do Pico". ivar.azores.gov.pt. Retrieved 11 January 2021.
  9. ^ a b c "Pico História". visitazores.com. Retrieved 11 January 2021.
  10. ^ "Baleeiros açorianos: a história que não se repete". RTP. Retrieved 11 January 2021.
  11. ^ "Geomorfologia". www.cvarg.azores.gov.pt. Retrieved 7 May 2021.
  12. ^ "Caracterização e Diagnóstico da Ilha do Pico" (PDF). servicos-sraa.azores.gov.pt. pp. 60–61. Retrieved 7 May 2021.
  13. ^ "Unidades Vulcanológicas". www.ivar.azores.gov.pt. Retrieved 7 May 2021.
  14. ^ "Ocupação do Solo | Carta de Ocupação do Solo 2018" (PDF). Ordenamento do Território dos Açores. Retrieved 13 September 2021.
  15. ^ "Natureza" (PDF). azores.gov.pt. Retrieved 14 June 2021.
  16. ^ a b de Azevedo, Eduardo B. (January 2014). "Climate Overview". Pico Island Natural History Handbook. Observatório Vulcanológico e Geotérmico dos Açores. pp. 16–28. Retrieved 16 June 2021.
  17. ^ "Normais Climatológicas - 1971-2000". IPMA. Retrieved 24 August 2021.
  18. ^ a b "Caracterização e Diagnóstico da Ilha do Pico" (PDF). servicos-sraa.azores.gov.pt. Retrieved August 4, 2020.
  19. ^ "Clima e Diferenciação Climática das Ilhas dos Açores" (PDF). www.climaat.angra.uac.pt. Retrieved August 4, 2020.
  20. ^ a b c "Atlas Climático Ibérico" (PDF). IPMA, AEMET. Retrieved 6 December 2020.
  21. ^ "Extremos Climatológicos - Arquipélago dos Açores". IPMA. Retrieved 20 August 2021.
  22. ^ "Climate: São Roque do Pico". Retrieved 2020-08-04.
  23. ^ "Horta Climate Normals 1961-1990". National Oceanic and Atmospheric Administration. Retrieved December 18, 2012.
  24. ^ "Rede Hidrometeorológica dos Açores - Direcção Regional do Ambiente - SRAAC - GRA". portal-sraa.azores.gov.pt. Retrieved 11 September 2021.
  25. ^ Santos, Carlota; de Matos, Paulo Teodoro. "A demografia das sociedades insulares Portuguesas. Séculos XV a XXI" (PDF). p. 28. Retrieved 14 June 2021.
  26. ^ Sousa, Ivo. "Evolução da população na ilha do Pico (desde 1849 a 2050)". Cais do Pico. Retrieved 14 June 2021.
  27. ^ Rocha, Gilberta Pavão Nunes. "A População das Regiões Insulares dos Açores e da Madeira em 2011". Instituto Nacional de Estatística. p. 4. Retrieved 14 June 2021.
  28. ^ "Vinha da Ilha do Pico, Património da Humanidade". www.visitportugal.com (in Portuguese). Retrieved 16 June 2021.
  29. ^ "Sustainable Tourism Destination EUCC" (PDF). Archived from the original (PDF) on 2016-09-18. Retrieved 2013-04-02.


  • Scarth, Alwyn; Tanguy, Jean-Claude (2001), Volcanoes of Europe, Oxford University Press, p. 243, ISBN 0-19-521754-3
  • Nunes, J.C. (1999), A actividade vulcânica na ilha do Pico do Plistocénio Superior ao Holocénio: Mecanismo eruptivo e hazard vulcânico. Tese de doutoramento no ramo de Geologia, especialidade de Vulcanologia, Ponta Delgada: University of the Azores, p. 357
  • Madeira, José Eduardo de Oliveira (1998), Estudos de neotectónica nas ilhas do Faial, Pico e S. Jorge: uma contribuição para o conhecimento geodinâmico da junção tripla dos Açores. Tese de Doutoramento no ramo de Geologia, especialidade em Geodinâmica Interna, Lisbon: Faculty of Sciences, University of Lisbon, p. 428
  • Madeira, José Eduardo de Oliveira; António Brum da Silveira (October 2003), Active tectonics and first paleoseismological results in Faial, Pico and S. Jorge islands (Azores, Portugal), 5, 46, Lisbon: Annals of Geophysics, pp. 733–761
  • Senos, M.L.; Gaspar, João Luís; Ferreira, Teresa; Cruz, L.; Nunes, J.C.; Pacheco, J. (1998), O terramoto do Faial de 9 de Julho de 1998, Proceedings do 1º Simpósio de Meterologia e Geofísica da AMPG, pp. 61–68

External linksEdit