Although it is out of the hypothetical focal region of the so-called Nankai Trough megathrust earthquake, the same mechanism is used to generate earthquakes. Similar to Hyuga-nada, the area near the epicenter of this earthquake is where the Philippine Sea plate is subducting into the Eurasian plate. Occurs near plate boundaries?Įpicenter distribution off the east coast of Osumi Peninsula However, the Tohoku Pacific Ocean side is an area where a large earthquake could occur at any time, so it is essential to take countermeasures on a daily basis. Both of these earthquakes are magnitude 4 class, so they are not large-scale earthquakes, so they are not considered to be particularly active. The earthquake mechanism is analyzed as a normal fault type with a tension axis in the north-northwest-southeast direction.Īlthough there were many earthquakes from the coast of Miyagi prefecture to the coast of Fukushima prefecture this spring, activity has calmed down a little since summer. This is the first earthquake with a seismic intensity of 3 or higher with an epicenter off the coast of Fukushima Prefecture since August 18. In this earthquake, a maximum seismic intensity of 3 was observed in Tamura City, Iwaki City, and Naraha Town in Fukushima Prefecture. The mechanism of the earthquake is analyzed as a reverse fault type with a pressure axis in the northwest-southeast direction.Īt around 3:14 on the following day, Friday, July 7, an earthquake with a magnitude of 4.4 and an estimated depth of about 30 km occurred off the coast of Fukushima Prefecture. It was the first time in about three months since July 6 that an earthquake with a seismic intensity of 3 or higher centered off the coast of Miyagi Prefecture. A maximum seismic intensity of 3 was observed in Kesennuma City and Ishinomaki City in Miyagi Prefecture, Kitakami City in Iwate Prefecture, and Ichinoseki City in Iwate Prefecture. At around 4:04 on the 6th (Thursday), an earthquake estimated to have a magnitude of 4.5 and a depth of 57 km occurred off the coast of Miyagi prefecture.
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