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Poster of the Offshore Maule, Chile Earthquake of 27 February 2010 - Magnitude 8.8
Tectonic Summary
This earthquake occurred at the boundary between the Nazca and South American tectonic plates. The two plates are converging at a rate of 80 mm per year. The earthquake occurred as thrust-faulting on the interface between the two plates, with the Nazca plate moving down and landward below the South American plate.
Coastal Chile has a history of very large earthquakes. Since 1973, there have been 13 events of magnitude 7.0 or greater. The February 27 shock originated about 230 km north of the source region of the magnitude 9.5 earthquake of May, 1960 the largest instrumentally recorded earthquake in the world. This magnitude 9.5 earthquake killed 1655 people in southern Chile and unleashed a tsunami that crossed the Pacific, killing 61 people in Hawaii, Japan, and the Philippines. Approximately 870 km to the north of the February 27 earthquake is the source region of the magnitude 8.5 earthquake of November, 1922. This great quake significantly impacted central Chile, killing several hundred people and causing severe property damage. The 1922 quake generated a 9-meter local tsunami that inundated the Chile coast near the town of Coquimbo; the tsunami also crossed the Pacific, washing away boats in Hilo harbor, Hawaii. The magnitude 8.8 earthquake of February 27, 2010 ruptured the portion of the South American subduction zone separating these two massive historical earthquakes.
A large vigorous aftershock sequence can be expected from this earthquake
In September 2006 a team of research scientists at the highly regarded Technical University of Delft in the Netherlands published the findings of their research into the La Palma Tsunami phenomenon. Their research was highly critical of the 'Day' theory. They built several models similar to that of Day et al., but even with parameters exceeding the realms of reasonable possibility they were unable to create a tsunami. Even with their most unrealistic 'worst case scenario' they only managed to predict a wave of between 15 and 100 cm (39 in).
There is however, a consensus by geologists and volcanologists that edifice failure (large-scale collapses or mass wasting) of volcanic islands does occur and that large tsunamis have occurred in the Atlantic in the geological past. Despite this there is still no evidence reliably proving a cause and effect. All the documented large scale tsunamis in the Atlantic have been verifiably attributed to underwater earthquakes and not island collapses.[citation needed] Evidence of Tsunami deposits has been reported from the Caribbean and the Canary Islands. Since the 1990s the area has been (and continues to be), monitored and no movement has been detected.[citation needed] Ongoing and recent (2008) monitoring shows that the dimensions accord with those recorded in 1949. Thereby indicating that the block has not moved since 1949[citation needed]. Controversial evidence on the island of Bermuda is said to be tsunamite deposited by a tsunami that was generated by edifice failure on the adjacent island of El Hierro.
The actual distances involved in the 1949 rift are as follows: horizontal ~1 metre, vertical ~2 metres. Volume involved of the whole of the Cumbre Vieja is ~5 x 1011 m3 with an estimated mass of 1.5 x 1015 kg.
I offer these thoughts because the Chile earthquake and aftershocks are directing the news media to focus on tsunamis when the real story is still happening in the Andes.
What are the chances of Alaska being next on the list for a major quake....??
Originally posted by silo13
reply to post by operation mindcrime
What are the chances of Alaska being next on the list for a major quake....??
While watching the HUGE tremors being reported yesterday (repeated shakes of over 5.0) I was surprised to see Alaska also had a shake. Though it was a 2.1, and I'm not sure how often that happens, regardless there is movement there.
Stay Safe
peace