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05-30-2015, 09:49 PM
Although the quake was 875 km (543 miles) from Tokyo, and an astounding 678 km deep, it was still felt significantly in the Tokyo area.
What concerns me is, this is on the Izu Trench, which is the southern segment of the Japan Trench where the M9 Tohoku quake occurred recently, but on the other side of the Sagami Trough. The Sagami Trough forms a convergent boundary near Tokyo with the Okhotsk and Philippine Sea plates, and was the source of the M7.9 Great Kanto earthquake of 1923 which nearly destroyed Tokyo.
Could this M7.8 be a foreshock to a larger quake on this segment of the Izu Trench like there was for the Tohoku quake?
Could these large quakes on either side of the Sagami Trough place enough stress on the area to accelerate the time interval for the next great Tokyo quake?
A large quake in this area happens on average every 70 years, and it has now been 91.
At least Japan is very attuned with their seismic history and are very well prepared. The anniversary of the Kanto quake, September 1st, is now National Disaster Prevention Day in Japan. A day of remembrance and preparedness training and drills.
Brian
What concerns me is, this is on the Izu Trench, which is the southern segment of the Japan Trench where the M9 Tohoku quake occurred recently, but on the other side of the Sagami Trough. The Sagami Trough forms a convergent boundary near Tokyo with the Okhotsk and Philippine Sea plates, and was the source of the M7.9 Great Kanto earthquake of 1923 which nearly destroyed Tokyo.
Could this M7.8 be a foreshock to a larger quake on this segment of the Izu Trench like there was for the Tohoku quake?
Could these large quakes on either side of the Sagami Trough place enough stress on the area to accelerate the time interval for the next great Tokyo quake?
A large quake in this area happens on average every 70 years, and it has now been 91.
At least Japan is very attuned with their seismic history and are very well prepared. The anniversary of the Kanto quake, September 1st, is now National Disaster Prevention Day in Japan. A day of remembrance and preparedness training and drills.
Brian