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2017 Komandorski Islands Earthquake
On July 17, an earthquake struck near the Komandorski Islands, east of the Kamchatka Peninsula in the Bering Sea at (23:34:13 UTC). Although there were no casualties from this earthquake, it was notable for a rare characteristic known as supershear, and is one of the few times a supershear earthquake has been observed. Its rupture length of 400 km is also one of the longest in the world for a strike-slip fault, comparable to the 1906 San Francisco and 2001 Kokoxili earthquake. It was preceded by a few foreshocks months earlier, and aftershocks that continued for nearly six months. Tectonic setting The 7.8 earthquake nucleated along the Bering Fracture Zone, parallel to the Aleutian Islands arc and Aleutian Subduction Zone. This is a transform fault between the Pacific and North American Plates, and in between, the Komandorski Sliver. Formed from the highly oblique movement of the Pacific Plate, the direction of convergence is nearly parallel to the trench at 7.8 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Strike-slip Tectonics
Strike-slip tectonics or wrench tectonics is the type of tectonics that is dominated by lateral (horizontal) movements within the Earth's crust (and lithosphere). Where a zone of strike-slip tectonics forms the boundary between two tectonic plates, this is known as a transform or conservative plate boundary. Areas of strike-slip tectonics are characterised by particular deformation styles including: ''stepovers'', ''Riedel shears'', ''flower structures'' and ''strike-slip duplexes''. Where the displacement along a zone of strike-slip deviates from parallelism with the zone itself, the style becomes either transpressional or transtensional depending on the sense of deviation. Strike-slip tectonics is characteristic of several geological environments, including oceanic and continental transform faults, zones of oblique collision and the deforming foreland of zones of continental collision. Deformation styles Stepovers When strike-slip fault zones develop, they typically form as ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
North American Plate
The North American Plate is a tectonic plate covering most of North America, Cuba, the Bahamas, extreme northeastern Asia, and parts of Iceland and the Azores. With an area of , it is the Earth's second largest tectonic plate, behind the Pacific Plate (which borders the plate to the west). It extends eastward to the Mid-Atlantic Ridge and westward to the Chersky Range in eastern Siberia. The plate includes both continental and oceanic crust. The interior of the main continental landmass includes an extensive granitic core called a craton. Along most of the edges of this craton are fragments of crustal material called terranes, which are accreted to the craton by tectonic actions over a long span of time. It is thought that much of North America west of the Rocky Mountains is composed of such terranes. Boundaries The southern boundary with the Cocos Plate to the west and the Caribbean Plate to the east is a transform fault, represented by the Swan Islands Transform Fault unde ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Earthquakes In Russia
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 c ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
2017 Earthquakes
This is a list of earthquakes in 2017. Only earthquakes of magnitude 6 or above are included, unless they result in damage and/or casualties, or are notable for some other reason. 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) ShakeMap data. Major events took place in Iran and Mexico, with the latter experiencing two such events, one of them exceeding magnitude 8. Compared to other years An increase in detected earthquake numbers does not necessarily represent an increase in earthquakes ''per se''. Population increase, habitation spread, and advances in earthquake detection technology all contribute to higher earthquake numbers being recorded over time. By death toll Listed are earthquakes with at least 10 dead. By magnitude Listed are earthquakes with at least 7.0 magnitude. By month January February March April May June Jul ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
List Of Earthquakes In Russia ...
Earthquakes in Russia have occasionally been damaging and deadly. Map Some of the largest Russian earthquakes since the latter half of the 20th century are the 1958/1963 and 2006/2007 earthquakes in the Kuril Islands near Japan, as well as the 1952/1959 earthquakes in the Kamchatka Peninsula, all of which were ≥ 8.0 M. See also the Kuril–Kamchatka Trench. Earthquakes See also *Geology of Russia *Kamchatka earthquakes *List of tectonic plate interactions *List of volcanoes in Russia References {{Europe topic, List of earthquakes in Russia earthquakes earthquakes Earthquakes 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 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
List Of Earthquakes In 2017
This is a list of earthquakes in 2017. Only earthquakes of magnitude 6 or above are included, unless they result in damage and/or casualties, or are notable for some other reason. 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. Major events took place in Iran and Mexico, with the latter experiencing two such events, one of them exceeding magnitude 8. Compared to other years An increase in detected earthquake numbers does not necessarily represent an increase in earthquakes ''per se''. Population increase, habitation spread, and advances in earthquake detection technology all contribute to higher earthquake numbers being recorded over time. By death toll Listed are earthquakes with at least 10 dead. By magnitude Listed are earthquakes with at least 7.0 magnitude. By month January February March April ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Alaska
Alaska ( ; russian: Аляска, Alyaska; ale, Alax̂sxax̂; ; ems, Alas'kaaq; Yup'ik: ''Alaskaq''; tli, Anáaski) is a state located in the Western United States on the northwest extremity of North America. A semi-exclave of the U.S., it borders the Canadian province of British Columbia and the Yukon territory to the east; it also shares a maritime border with the Russian Federation's Chukotka Autonomous Okrug to the west, just across the Bering Strait. To the north are the Chukchi and Beaufort Seas of the Arctic Ocean, while the Pacific Ocean lies to the south and southwest. Alaska is by far the largest U.S. state by area, comprising more total area than the next three largest states (Texas, California, and Montana) combined. It represents the seventh-largest subnational division in the world. It is the third-least populous and the most sparsely populated state, but by far the continent's most populous territory located mostly north of the 60th parallel, with ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Attu Station, Alaska
Attu Station is a census-designated place (CDP) located on Attu Island in the Aleutians West Census Area, Alaska, Aleutians West Census Area in the U.S. state of Alaska. The population was 21 at the United States Census, 2010, 2010 census, consisting entirely of coast guard personnel who resided and worked at Casco Cove Coast Guard Station, but left the island when the station was closed in August 2010, leaving it uninhabited. LORAN Station Attu had provided a navigational signal for mariners of the North Pacific since the 1970s.Home page for USCG Loran Station Attu (modified 7/23/2007) Although often considered the westernmost place in the United States, due to its location relative to the rest of the country, Attu Station is actually one of the easternmost points in the United States ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Shear Wave
__NOTOC__ In seismology and other areas involving elastic waves, S waves, secondary waves, or shear waves (sometimes called elastic S waves) are a type of elastic wave and are one of the two main types of elastic body waves, so named because they move through the body of an object, unlike surface waves. S waves are transverse waves, meaning that the direction of particle motion of a S wave is perpendicular to the direction of wave propagation, and the main restoring force comes from shear stress. Therefore, S waves cannot propagate in liquids with zero (or very low) viscosity; however, they may propagate in liquids with high viscosity. The name ''secondary wave'' comes from the fact that they are the second type of wave to be detected by an earthquake seismograph, after the compressional primary wave, or P wave, because S waves travel more slowly in solids. Unlike P waves, S waves cannot travel through the molten outer core of the Earth, and this causes a shadow zone for S w ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Focal Mechanism
The focal mechanism of an earthquake describes the deformation in the source region that generates the seismic waves. In the case of a fault-related event it refers to the orientation of the fault plane that slipped and the slip vector and is also known as a fault-plane solution. Focal mechanisms are derived from a solution of the moment tensor for the earthquake, which itself is estimated by an analysis of observed seismic waveforms. The focal mechanism can be derived from observing the pattern of "first motions", that is, whether the first arriving P waves break up or down. This method was used before waveforms were recorded and analysed digitally and this method is still used for earthquakes too small for easy moment tensor solution. Focal mechanisms are now mainly derived using semi-automatic analysis of the recorded waveforms. Moment tensor solutions The moment tensor solution is typically displayed graphically using a so-called ''beachball'' diagram. The pattern of en ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Near Islands
The Near Islands or Sasignan Islands ( ale, Sasignan tanangin, russian: Ближние острова) are a group of American islands in the Aleutian Islands in southwestern Alaska, between the Russian Commander Islands to the west and the Rat Islands to the east. Geography The largest of the Near Islands are Attu and Agattu, which shelter a few rocks in the channel between them. The other important islands are the Semichi Islands to their northeast, notable among which are Alaid Island (Alaska), Alaid, Nizki Island, Nizki and Shemya Island, Shemya. About 20 miles to the east-southeast from Shemya are small rocky reefs known as the Ingenstrem Rocks. The total land area of all of the Near Islands is 1,143.785 km² (441.618 sq mi), and their total population was 47 persons as of the United States Census, 2000, 2000 census. The only populated island is Shemya; the Attu Station, Alaska, U.S. Coast Guard station on Attu closed in 2010 and all inhabitants left the island late ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
