Posted By: The_Fox [Send E-Mail]
Date: Saturday, 9-Feb-2013 04:44:51
Thank you wj.
The deadly 8.0 earthquake and tsunami that hit the Solomon Islands days ago, struck along a subduction zone, the same geologic setting responsible for the world’s most powerful earthquakes. In a subduction zone, two of Earth’s tectonic plates meet and one slides beneath the other into the mantle, the deeper layer beneath the crust. The Solomon Islands sits above the collision between the Australia and Pacific plates.
In the region of the magnitude-8.0 earthquake, the Australia plates dives beneath the Pacific plate toward the east-northeast at a geologically speedy 3.7 inches (94 millimeters) per year, according to the Incorporated Research Institutions for Seismology (IRIS). The earthquake hit at a depth of 17.8 miles (28.7 kilometers) and was the second largest earthquake in the Solomon Islands region in almost 40 years, IRIS said in a statement. Several aftershocks followed; the largest measuring magnitude 6.6, according to the U.S. Geological Survey (USGS).
The tsunami generated by the quake, reported as 3 feet (0.9 meters) in height, hit villages on Santa Cruz Island, destroying structures and homes, according to news reports. A tsunami watch was issued for Australia, Indonesia and New Zealand, but not for the rest of the Pacific, according to the West Coast and Alaska Tsunami Warning Center. Subduction zone quakes shove the seafloor in one sudden movement, which may generate a tsunami by pushing the ocean water above. However, depending on the depth and size of the earthquake, the actual seafloor surface may not move a significant amount, so a big earthquake doesn’t always produce a massive wave.
Recent & Past Earthquakes in the Solomon Islands- list and interactive map past 7 Days
State of Disaster Declared on Santa Cruz Islands as Earthquake Swarm Continues