【EARTHQUAKE】M8.3 46km W of Illapel, Chile

J.O.R.NEWS73さんが、2015-09-18 17:13:44に公開した『【EARTHQUAKE】M8.3 46km W of Illapel, Chile』は、動画ニュースnetがYoutubeから厳選して紹介している動画ニュースです。

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☆タイトル：【EARTHQUAKE】M8.3 46km W of Illapel, Chile

☆投稿者：J.O.R.NEWS73

☆公開日：2015-09-18 17:13:44

☆視聴時間：6:48

☆視聴回数：36

https://www.youtube.com/channel/UCPzejmDh12G3giFzqrSZEtA
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掲載元：http://earthquake.usgs.gov/earthquakes/eventpage/us20003k7a#general_summary

M8.3 – 46km W of Illapel, Chile

Tectonic Summary
The September 16, 2015 M 8.3 earthquake west of Illapel, Chile, occurred as the result of thrust faulting on the interface between the Nazca and South America plates in Central Chile. At the latitude of this event, the Nazca plate is moving towards the east-northeast at a velocity of 74 mm/yr with respect to South America, and begins its subduction beneath the continent at the Peru-Chile Trench, 85 km to the west of the September 16 earthquake. The size, location, depth and mechanism of this event are all consistent with its occurrence on the megathrust interface in this region.

While commonly plotted as points on maps, earthquakes of this size are more appropriately described as slip over a larger fault area. Events of the size of the September 16, 2015 earthquake are typically about 230×100 km in size (length x width).

Chile has a long history of massive earthquakes, including the 2010 M 8.8 Maule earthquake in central Chile, which ruptured a ~400 km long section of the plate boundary south of this 2015 event (and to the south of the Juan Fernandez Ridge, which enters the trench immediately south of the 2015 earthquake). This subducton zone also hosted the largest earthquake on record, the 1960 M 9.5 earthquake in southern Chile. Over the century prior to the September 16, 2015 earthquake, the region within 400 km of this event has hosted 15 other M 7+ earthquakes.

Seismotectonics of South America (Nazca Plate Region)

The South American arc extends over 7,000 km, from the Chilean margin triple junction offshore of southern Chile to its intersection with the Panama fracture zone, offshore of the southern coast of Panama in Central America. It marks the plate boundary between the subducting Nazca plate and the South America plate, where the oceanic crust and lithosphere of the Nazca plate begin their descent into the mantle beneath South America. The convergence associated with this subduction process is responsible for the uplift of the Andes Mountains, and for the active volcanic chain present along much of this deformation front. Relative to a fixed South America plate, the Nazca plate moves slightly north of eastwards at a rate varying from approximately 80 mm/yr in the south to approximately 65 mm/yr in the north. Although the rate of subduction varies little along the entire arc, there are complex changes in the geologic processes along the subduction zone that dramatically influence volcanic activity, crustal deformation, earthquake generation and occurrence all along the western edge of South America.

8.3 Chile Earthquake: Raw Footage from Different Cameras of Moment Quake Struck