2023/01/29 10:27 Weather News
Earthquakes were conspicuous in the Kanto region to the southern Tohoku region, and tended to be few in other regions. There was one earthquake with a seismic intensity of 3 or higher. (Tally from January 23rd to 29th at 10:00)
Domestic: M5.1 occurred off the coast of Fukushima Prefecture Last year and the year before last, M7 class occurred
This is the first time in about three months since the October 21, 2011 earthquake (maximum seismic intensity of 5 lower) that an earthquake with a seismic intensity of 4 or more occurred off the coast of Fukushima Prefecture. The mechanism of the earthquake is analyzed as a reverse fault type with a pressure axis in the northeast-southwest direction.
In recent years, there have been a series of large earthquakes off the coast of Fukushima Prefecture. Two years ago, on February 13, 2021, a magnitude 7.3 earthquake occurred, and on March 16, 2022, a magnitude 7.4 earthquake occurred.
I don’t know if a similar earthquake will occur this year, but it’s true that it happened two years in a row at a similar time, so it might be a good idea to reconfirm earthquake countermeasures.
World: Another deep earthquake in Argentina, South America
In the early hours of the 25th (Wednesday) Japan time, an earthquake with a magnitude of 6.4 and an estimated depth of about 596 km occurred with an epicenter in northern Argentina. The earthquake mechanism is analyzed as a normal fault type with a tension axis in the east-northeast-west-southwest direction.
Four days ago, on the 21st (Saturday), an earthquake with a magnitude of 6.8 occurred at almost the same epicenter. A sequence of actions is possible, as the mechanisms are also similar.
On the South American continent, the Nazca Plate is subducting into the South American Plate, and large earthquakes often occur in shallow areas along the Pacific coast such as Chile. The farther away from the sea, the deeper the epicenter, and in northern Argentina near the epicenter this time, an earthquake occurred at a depth of 500 to 600 km.
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.