☆PSA8 β 地震/Earthquake ベータ BETA☆ - 赤,Changes in the b value in and around the focal areas of the M6.9 and M6.8 earthquakes off the coast of Miyagi prefecture, Japan, in 2021 | Earth, Planets and Space | Full Text,M 8.2 earthquake in northern Chile - Jay Patton online,Changes in the b value in and around the focal areas of the M6.9 and M6.8 earthquakes off the coast of Miyagi prefecture, Japan, in 2021 | Earth, Planets and Space | Full Text,File:Shindomap 2011-03-11 Tohoku earthquake.png - Wikipedia