NEW MODERATE EARTHQUAKE IN AYSEN AND LINKED BIG EARTHQUAKE 1960 05 22

A new earthquake has taken place in Aysen only 9 miles away from the other two moderate earthquakes which peked the seismic swarm in Aysen, southern Chile. The 5.60 mb GS magnitude seism is the third in the area and highest so far.

The preliminary parameters of this new seism are:

DATE / TIME (UTC) / LAT. / LONG. / DEPTH / MAGNITUDE

2007 02 23 / 195549 / -45.26 / -72.02 / 24 Km / 5.60 mb GS

A few miles nearer to the surface, the magnitude of 5.60 mbGS makes it the strongest in many years in the area. The third moderate earthquake since Jan 23rd, a month ago, is still some 100 Kms from the Aysen fjord where at the seismic swarm has been located.

The (linked) map for Big earthquake 1960 05 22 has been added. The rupture of some 1000 Kms is shown as a sequence of aftershocks which extend well beyond 1961, 1963 and 1967. The last major earthquakes hit the mainshock area in 1974 and 1975.

ALASKA KAMTCHAKA SEIMICITY MAP

The map has been added with no comments for your information.

SEISMIC SWARM IN AYSEN CHILE and Big Earthquake 1960 05 21 map.

The Seismicity Map shows, with dates in blue, seismicity of magnitude > 5.0 mb, around the Hudson Volcano from 1990 to 2000, and a short distance North-East, the two moderate earthquakes so far, in a much publicized swarm that has kept people, scientists and the press worried day and night. However, the abundant tremors have all been of lesser magnitudes (mb<>

The situation is reminiscent of abundant seismicity in June 2006 in the Alaska Subduction Zone. However, in that instance nothing happened close to the swarm location, instead two Big Earthquakes (Magnitude > 8.0) took place South West of Alaska at the Kuril Islands, same subduction zone.

The Map of Big Earthquake 1960 05 21 has been added. It shows the sequence of major earthquakes and the 8.5 Ms magnitude Big Earthquake of 1960 05 22 (World's biggest), together with associated seismicity and earthquakes magnitude > 6.0 Mw. The rupture took fifteen days to reach below the Hudson Volcano which later erupted in 1991. The 1960 05 21 sequence may have lasted until 1974. No major activity has taken place in the area since.