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1964 Rosais Earthquake
The 1964 Rosais earthquake ( pt, Crise sísmica dos Rosais) was a series of seismic swarms occurring in February 1964, leading to two major earthquakes on 15 and 21 February, resulting in the destruction of most of the habitable dwellings on the western part of the island of São Jorge, in the archipelago of the Azores. The event resulted in the evacuation of approximately 5,000 residents from that island to Terceira, Pico and Faial. History Geologic The island of São Jorge is divided into two tectonic regions by tectonic fractures oriented north-northwest to south-southeast, located along an axis between Norte Pequeno and Calheta (the Ribeira Seca fault).G. Zbyszewski and T. Pacheco da Rosa (1977), p.37 The northwest portion of the island is the most modern, consisting of basalt and intermediary rock (andesites) of the Rosais Volcanic Complex. This region was also covered swaths of the Manadas complex and debris from the 1580 and 1808 volcanic eruptions. The first eruption (1 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Moment Magnitude Scale
The moment magnitude scale (MMS; denoted explicitly with or Mw, and generally implied with use of a single M for magnitude) is a measure of an earthquake's magnitude ("size" or strength) based on its seismic moment. It was defined in a 1979 paper by Thomas C. Hanks and Hiroo Kanamori. Similar to the local magnitude/Richter scale () defined by Charles Francis Richter in 1935, it uses a logarithmic scale; small earthquakes have approximately the same magnitudes on both scales. Despite the difference, news media often says "Richter scale" when referring to the moment magnitude scale. Moment magnitude () is considered the authoritative magnitude scale for ranking earthquakes by size. It is more directly related to the energy of an earthquake than other scales, and does not saturate—that is, it does not underestimate magnitudes as other scales do in certain conditions. It has become the standard scale used by seismological authorities like the U.S. Geological SurveyThe "USGS Ear ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
History Of The Azores
The following article describes the history of the Azores, an archipelago composed of nine volcanic islands in the Macaronesia region of the North Atlantic Ocean, about west of Lisbon, about northwest of Morocco, and about southeast of Newfoundland, Canada. Myth and legend Stories of islands in the Atlantic Ocean, legendary and otherwise, had been reported since classical antiquity. Utopian tales of the Fortunate Isles (or Isles of the Blest) were sung by poets like Homer and Horace. Plato articulated the legend of Atlantis. Ancient writers like Plutarch, Strabo and, more explicitly, Pliny the Elder and Ptolemy, testified to the real existence of the Canary Islands. The Middle Ages saw the emergence of a new set of legends about islands deep in the Atlantic Ocean. These were sourced in various places, e.g. the Irish ''immrama'', or missionary sailing voyages (such as the tales of Ui Corra and Saint Brendan) and the sagas of Norse adventurers (such as the Grœnlendin ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Earthquakes In Portugal
An earthquake (also known as a quake, tremor or temblor) is the shaking of the surface of the Earth resulting from a sudden release of energy in the Earth's lithosphere that creates seismic waves. Earthquakes can range in intensity, from those that are so weak that they cannot be felt, to those violent enough to propel objects and people into the air, damage critical infrastructure, and wreak destruction across entire cities. The seismic activity of an area is the frequency, type, and size of earthquakes experienced over a particular time period. The seismicity at a particular location in the Earth is the average rate of seismic energy release per unit volume. The word ''tremor'' is also used for non-earthquake seismic rumbling. At the Earth's surface, earthquakes manifest themselves by shaking and displacing or disrupting the ground. When the epicenter of a large earthquake is located offshore, the seabed may be displaced sufficiently to cause a tsunami. Earthquakes ca ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Earthquake Clusters, Swarms, And Sequences
An earthquake (also known as a quake, tremor or temblor) is the shaking of the surface of the Earth resulting from a sudden release of energy in the Earth's lithosphere that creates seismic waves. Earthquakes can range in intensity, from those that are so weak that they cannot be felt, to those violent enough to propel objects and people into the air, damage critical infrastructure, and wreak destruction across entire cities. The seismic activity of an area is the frequency, type, and size of earthquakes experienced over a particular time period. The seismicity at a particular location in the Earth is the average rate of seismic energy release per unit volume. The word ''tremor'' is also used for non-earthquake seismic rumbling. At the Earth's surface, earthquakes manifest themselves by shaking and displacing or disrupting the ground. When the epicenter of a large earthquake is located offshore, the seabed may be displaced sufficiently to cause a tsunami. Earthquakes ca ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
List Of Earthquakes In The Azores
The following is a list of the prominent or destructive earthquakes occurring in the Azores, or affecting the populace of the archipelago: History 16th century * 1522 Vila Franca earthquake (22 October 1522) * 1591 Vila Franca earthquake (26 July 1591) 17th century * 1614 "Caída da Praia" earthquake (24 May 1614) 18th century * 1717 Graciosa earthquake * 1730 Graciosa earthquake (13 June 1730) * 1757 Mandado de Deus earthquake (9 July 1757) 19th century * 1800 Terceira earthquake (25 June 1800) * 1801 Terceira earthquake (26 January 1801) * 1816 North Atlantic earthquake (2 February 1816) * 1837 Graciosa earthquake (21 January 1837) * 1841 "Caída da Praia" earthquake (15 June 1841) * 1852 São Miguel earthquake (16 April 1852) 20th century * 1926 Horta earthquake (31 August 1926) * 1932 São Miguel earthquake (5 August 1932) * 1935 São Miguel earthquake (27 April 1935) * 1937 Azores earthquake (21 November 1937) * 1939 Azores earthquake (8 May 1939) * 1950 Pr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
List Of Earthquakes In Portugal
This list documents major earthquakes affecting Portugal. See also * List of earthquakes in the Azores References {{Europe topic, List of earthquakes in Earthquakes in Portugal Portugal Portugal, officially the Portuguese Republic ( pt, República Portuguesa, links=yes ), is a country whose mainland is located on the Iberian Peninsula of Southwestern Europe, and whose territory also includes the Atlantic archipelagos of ... Earthquakes ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
List Of Earthquakes In 1964
This is a list of earthquakes in 1964. Only magnitude 6.0 or greater earthquakes appear on the list. Lower magnitude events are included if they have caused death, injury or damage. Events which occurred in remote areas will be excluded from the list as they wouldn't have generated significant media interest. All dates are listed according to UTC time. Maximum intensities are indicated on the Mercalli intensity scale and are sourced from United States Geological Survey (USGS) Strong ground motion, ShakeMap data. Alaska had the largest event of the year both in terms of magnitude and death toll. In March a great 1964 Alaska earthquake, magnitude 9.2 earthquake struck the southern part of the state. This was the largest earthquake in United States' history and currently ranks as 3rd largest globally. The quake and subsequent tsunami resulted in 139 deaths in total. In spite of such a large event there were only 11 other magnitude 7.0 + events which is below normal. Japan, Taiwan an ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Quonset Hut
A Quonset hut is a lightweight prefabricated structure of corrugated galvanized steel having a semi cylindrical cross-section. The design was developed in the United States, based on the Nissen hut introduced by the British during World War I. Hundreds of thousands were produced during World War II and military surplus was sold to the public. The name comes from the site of their first deployment at Quonset Point at the Davisville Naval Construction Battalion Center in Davisville, Rhode Island. Design and history The first Quonset huts were manufactured in 1941 when the United States Navy needed an all-purpose, lightweight building that could be shipped anywhere and assembled without skilled labor. The George A. Fuller construction company manufactured them, and the first was produced within 60 days of signing the contract. In 1946, the Great Lakes Steel Corporation claimed "the term 'Quonset,' as applied to builders and building materials, is a trade mark owned by the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
MV Terra Alta
The Terra Alta was a Portuguese motor yacht, constructed in the shipyards of Santo Amaro, the municipality of São Roque do Pico. It was a major ship that transported passenger and cargo in the waters of the central group of islands in the archipelago of the Azores, transformed from private hands into the fleet of Transmaçor. With a storied history, it had several incidents throughout the late 20th century, that eventually lead to it being broken-up and destroyed by the beginning of the 21st century. History On 20 April 1946, José Serpa Diogo ordered from Manuel Joaquim Melo (a project of the Nunes brothers, Manuel Inácio and António Nunes) in Santo Amaro the construction of the ship ''Terra Alta'' for 1400 contos.Fernando Faria Ribeiro (2007), p.106 In 1947, H-24-TL was launched, with a length, beam draught and gross weight, and with two 140 horsepower Alfa Romeo motors, permitting it to reach . The original project was criticized, principally due to the boat being excessi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Peak Ground Acceleration
Peak ground acceleration (PGA) is equal to the maximum ground acceleration that occurred during earthquake shaking at a location. PGA is equal to the amplitude of the largest absolute acceleration recorded on an accelerogram at a site during a particular earthquake. Earthquake shaking generally occurs in all three directions. Therefore, PGA is often split into the horizontal and vertical components. Horizontal PGAs are generally larger than those in the vertical direction but this is not always true, especially close to large earthquakes. PGA is an important parameter (also known as an intensity measure) for earthquake engineering, The design basis earthquake ground motion (DBEGM) is often defined in terms of PGA. Unlike the Richter and moment magnitude scales, it is not a measure of the total energy (magnitude, or size) of an earthquake, but rather of how hard the earth shakes at a given geographic point. The Mercalli intensity scale uses personal reports and observations to mea ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Toledo (Velas)
Toledo is an unincorporated human settlement in the civil parish of Santo Amaro (Velas), Santo Amaro, in the municipality of Velas, Azores, Velas in Portugal, Portuguese island of São Jorge Island in the Azores. History Although located in high altitude mountains of the northern coast, Toledo is situated with good access to potable water and springs, explaining its early settlement by Spain, Spanish and Portugal, Portuguese colonists. Its name was likely given to the area by early settlers from the Toledo (province), Toledo region in Spain, who arrived in the mid-15th and the 16th centuries, constructing houses and support structures to guard their animals and cereals, from rock excavated from cavities in the side of the mountain. These quarries were discovered in 2008, in the area of Ribeira Funda and Outeirão. The early settler families included Ávila (surname), Ávilas from Spain, Bettencourts of France (and the descendants of Jean de Bettencourt, the ''King of the Canary Is ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
