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2009 Vanuatu Earthquakes
The 2009 Vanuatu earthquakes were three earthquakes with magnitudes ranging from 7.4 to 7.8, constituting some of the largest earthquakes in Vanuatu's history. Tectonic Setting The Vanuatu earthquakes of October 7, 2009: M 7.7, Vanuatu, 22:03:14; M 7.8 Santa Cruz Islands, 22:18:51 UTC; and M 7.4, Vanuatu, 23:13:48; all occurred as a result of shallow reverse faulting on or near the plate boundary interface between the Indo-Australian Plate and Pacific Plates. In the region of these earthquakes, the Indo-Australian plate moves to the east-northeast with respect to the Pacific plate at a velocity of about 91 mm/yr. The Indo-Australian plate thrusts under the Pacific plate at the New Hebrides Trench and dips to the east-northeast. The locations, depths, and focal mechanism solutions for the October 7th events are all consistent with them resulting from reverse faulting associated with subduction along the Australia-Pacific plate boundary. The 7.8 earthquake of October 7, 2009 (22: ... [...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 wikt:accelerogram, 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 magnitude scale, Richter and Moment magnitude scale, moment magnitude scales, it is not a measure of the total seismic scales#Magnitude and intensity, energy (magnitude, or size) of an earthquake, but rather of how hard the earth shake ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Santa Monica
Santa Monica (; Spanish: ''Santa Mónica'') is a city in Los Angeles County, situated along Santa Monica Bay on California's South Coast. Santa Monica's 2020 U.S. Census population was 93,076. Santa Monica is a popular resort town, owing to its climate, beaches, and hospitality industry. It has a diverse economy, hosting headquarters of companies such as Hulu, Universal Music Group, Lionsgate Films, and The Recording Academy. Santa Monica traces its history to Rancho San Vicente y Santa Monica, granted in 1839 to the Sepúlveda family of California. The rancho was later sold to John P. Jones and Robert Baker, who in 1875, along with his Californio heiress wife Arcadia Bandini de Stearns Baker, founded Santa Monica, which incorporated as a city in 1886. The city developed into a seaside resort during the late 19th and early 20th centuries, with the creation of tourist attractions such as Palisades Park, the Santa Monica Pier, Ocean Park, and the Hotel Casa del Mar. Hi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
2009 In Vanuatu
9 (nine) is the natural number following and preceding . Evolution of the Arabic digit In the beginning, various Indians wrote a digit 9 similar in shape to the modern closing question mark without the bottom dot. The Kshatrapa, Andhra and Gupta started curving the bottom vertical line coming up with a -look-alike. The Nagari continued the bottom stroke to make a circle and enclose the 3-look-alike, in much the same way that the sign @ encircles a lowercase ''a''. As time went on, the enclosing circle became bigger and its line continued beyond the circle downwards, as the 3-look-alike became smaller. Soon, all that was left of the 3-look-alike was a squiggle. The Arabs simply connected that squiggle to the downward stroke at the middle and subsequent European change was purely cosmetic. While the shape of the glyph for the digit 9 has an ascender in most modern typefaces, in typefaces with text figures the character usually has a descender, as, for example, in . The mo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
2009 Earthquakes
Earthquakes in 2009 resulted in 1,853 fatalities. The 2nd Sumatra earthquake caused an estimated 1,117 deaths to that island, while other majors events struck Italy or Costa Rica. Also notable, the 2009 Samoa earthquake and tsunami registered an 8.1 on the moment magnitude scale, the most powerful earthquake in 2009. The tsunami associated with the Samoa earthquake caused tsunami advisories and warning across the Pacific Ocean rim, also known as the Ring of Fire. Compared to other years Overall By death toll * Note: At least 10 dead By magnitude * Note: At least 7.0 magnitude By month January * A magnitude 7.7 earthquake struck Papua, Indonesia on January 3, killing 5 people. * A magnitude 6.6 earthquake struck Northern Afghanistan on January 3. * A magnitude 7.4 earthquake struck Papua, Indonesia on January 3. * A magnitude 4.3 earthquake struck Greece, killing 1 person. * A magnitude 6.0 earthquake struck Papua, Indonesia on January 6. * A magnitude 6.1 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Earthquakes In Vanuatu
Earthquakes in Vanuatu are frequent and are sometimes accompanied by tsunami, though these events are not often destructive. The archipelago, which was formerly known as New Hebrides, lies atop a complex and active plate boundary in the southwestern Pacific Ocean. Overall, the population in this region resides in structures that are highly vulnerable to earthquake shaking, though some resistant structures exist. Most buildings in Vanuatu are constructed with lumber. Tectonic setting The primary tectonic feature of the island chain is the New Hebrides Trench, the convergent boundary of the Australian and Pacific Plates. Along the Wadati–Benioff zone, earthquake activity has been observed as shallow, intermediate, and deep-focus events at depths of up to . Volcanic activity is also present along this north-northwest trending and northeast- dipping oceanic trench. While much of the island arc experiences intermediate-depth earthquakes along a Wadati–Benioff zone that dips s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
2021 Loyalty Islands Earthquake
The 2021 Loyalty Islands earthquake was a 7.7 magnitude earthquake that struck offshore between Vanuatu and New Caledonia on February 11, 2021 at 00:19 local time. It is the 4th largest earthquake of 2021. Tectonic setting Located about 415 km to the east of the island of New Caledonia in the southwest Pacific Ocean occurred as the result of low angle thrust faulting on or near the plate boundary interface between the Indo-Australian and Pacific plates. Focal mechanism solutions indicate the earthquake occurred on either a shallow fault striking west and dipping to the north, or on a steep fault striking east. The earthquake was preceded by two foreshocks of M 6.1 and M 6.0 in the hour before the earthquake. At the location of this earthquake, the Indo-Australian plate moves towards the east-northeast with respect to the Pacific at a rate of approximately 75 mm/yr. At the South New Hebrides Trench, Australia lithosphere converges with and sinks beneath the Pacific pla ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
2021 Kermadec Islands Earthquakes
The 2021 Kermadec Islands earthquakes were a series of earthquakes with magnitudes of 8.1 and 7.4 that occurred at 19:28:31 UTC on 4 March 2021. The epicentres were located southeast of Raoul Island in the Kermadec Islands, part of the New Zealand outlying islands. The main magnitude 8.1 earthquake was preceded by a magnitude 7.4 foreshock and followed by a magnitude 6.1 aftershock. A separate, unrelated magnitude 7.3 earthquake occurred off the coast of the North Island of New Zealand, approximately 900 km to the south, several hours before the main quakes. As of January 2023, there have been nearly 3,000 aftershocks, with more than a dozen of them exceeding magnitude 6. Tectonic setting The Kermadec-Tonga subduction zone runs east of the Kermadec Islands and marks the boundary between the Australian and Pacific plates. This convergent boundary is where the denser Pacific Plate subducts or dives beneath the less dense Australian Plate. Earthquakes The main magnitude 8. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
1999 Ambrym Earthquake
The 1999 Ambrym earthquake occurred on November 26 at with a moment magnitude of 7.4 and a maximum Mercalli intensity of VII (''Very strong''). The back arc thrust event occurred within the Vanuatu archipelago, just to the south of the volcanic island of Ambrym. Vanuatu, which was previously known as New Hebrides, is subject to volcanic and earthquake activity because it lies on an active and destructive plate boundary called the New Hebrides Subduction Zone. While the National Geophysical Data Center classified the total damage as moderate, a destructive local tsunami did result in some deaths, with at least five killed and up to 100 injured. This was one of very few events along the New Hebrides Subduction Zone that has been studied. Scientists from technical institutes in the region submitted papers to the scientific journals about the event, and while not all data on each of the aspects of the event are in agreement, what is certain is that the d'Entrecasteaux Ridge is pro ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
List Of Earthquakes In Vanuatu
Earthquakes in Vanuatu are frequent and are sometimes accompanied by tsunami, though these events are not often destructive. The archipelago, which was formerly known as New Hebrides, lies atop a complex and active plate boundary in the southwestern Pacific Ocean. Overall, the population in this region resides in structures that are highly vulnerable to earthquake shaking, though some resistant structures exist. Most buildings in Vanuatu are constructed with lumber. Tectonic setting The primary tectonic feature of the island chain is the New Hebrides Trench, the convergent boundary of the Australian and Pacific Plates. Along the Wadati–Benioff zone, earthquake activity has been observed as shallow, intermediate, and deep-focus events at depths of up to . Volcanic activity is also present along this north-northwest trending and northeast- dipping oceanic trench. While much of the island arc experiences intermediate-depth earthquakes along a Wadati–Benioff zone that dips st ... [...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] |
Atka, Alaska
Atka ( ale, Atx̂ax̂, russian: Атка) is a small city located on the east side of Atka Island, in Aleutians West Census Area, Alaska, United States. The population was 53 at the 2020 census, down from 61 in 2010. The population of Atka is nearly entirely Aleut (Unangan). The major industry is fishing. Geography Atka is located at (52.199271, -174.213398). According to the U.S. Census Bureau, the hamlet has a total area of , of which, of it is land and of it (75.81%) is water. Atka is formed by a shield volcano, with a number of outlets. The highest point on Atka is Korovin Volcano, which last erupted in 2006. Demographics Atka first appeared on the 1880 U.S. Census as the unincorporated Aleut village of "Nazan". It had 236 residents, of which 220 were Aleut, 14 were Creole (Mixed Russian & Native) and 2 were White. In 1890, it returned as Atka, with 132 residents, of which 116 were native, 15 were Creole and 1 White. It did not appear again under the name "Atka" on th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
California
California is a U.S. state, state in the Western United States, located along the West Coast of the United States, Pacific Coast. With nearly 39.2million residents across a total area of approximately , it is the List of states and territories of the United States by population, most populous U.S. state and the List of U.S. states and territories by area, 3rd largest by area. It is also the most populated Administrative division, subnational entity in North America and the 34th most populous in the world. The Greater Los Angeles area and the San Francisco Bay Area are the nation's second and fifth most populous Statistical area (United States), urban regions respectively, with the former having more than 18.7million residents and the latter having over 9.6million. Sacramento, California, Sacramento is the state's capital, while Los Angeles is the List of largest California cities by population, most populous city in the state and the List of United States cities by population, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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