2022/10/09 10:09 Weather news
Earthquakes from the coast of Fukushima Prefecture to the coast of Miyagi Prefecture are conspicuous. Overall, there are not many earthquakes with epicenters on land. There were two earthquakes with a seismic intensity of 3 or higher. (Tally from October 3rd to October 9th at 10:00)
Japan: Seismic intensity 3 in the early morning off Miyagi Prefecture and off Fukushima Prefecture every day
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. The mechanism of the earthquake is analyzed as a reverse fault type with a pressure axis in the northwest-southeast direction.
At 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. In this earthquake, a maximum seismic intensity of 3 was observed in Tamura City, Iwaki City, and Naraha Town in Fukushima Prefecture.
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. The earthquake mechanism is analyzed as a normal fault type with a tension axis in the north-northwest-southeast direction.
Although 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. Both of these earthquakes are magnitude 4 class, so they are not large-scale earthquakes, so they are not considered to be particularly active.
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.
Japan: A series of earthquakes with a seismic intensity of 1 occur in Tachibana Bay, Nagasaki Prefecture
After that, a magnitude 2.3 earthquake occurred at around 18:32 on the 3rd (Monday) and a magnitude 2.2 earthquake occurred on the 4th (Tuesday), both of which had a maximum seismic intensity of 1.
Earthquakes related to the volcanic activity of Mt. Unzen have occurred in Tachibana Bay. In addition, the Unzen fault group is distributed from Shimabara Peninsula to Tachibana Bay, and earthquakes unrelated to volcanic activity have also occurred.
Recently, an earthquake with a magnitude of 4.3 and a maximum seismic intensity of 4 occurred in June 2017, and according to old records, a large earthquake with a magnitude of 6.9 occurred in 1922, causing great damage.
World: M5.8 earthquake in northern Peru
On the evening of the 5th (Wednesday) Japan time, an earthquake estimated to have a magnitude of 5.8 and a depth of about 48 km occurred with an epicenter in the northern part of Peru in South America. The mechanism of the earthquake is analyzed as a reverse fault type with a pressure axis in the east-northeast-west-southwest direction.
Peru is located on the plate boundary where the Nazca Plate is subducting the South American Plate, and is an area with many large earthquakes.
From northern Peru to Ecuador, where this earthquake occurred, shallow coastal earthquakes along the plate boundary and deep inland earthquakes occur frequently. A large earthquake of magnitude 8.0 occurred.
Reference materials, etc.
*Information on earthquake sources and seismic intensity in Japan is from the Japan Meteorological Agency unless otherwise specified. Overseas epicenter information is from the United States Geological Survey (USGS) unless otherwise specified. There may be differences in hypocenter information depending on the publishing organization.