2023/02/26 11:00 Weather News
Earthquakes are conspicuous on the Pacific Ocean side from Hokkaido to Tohoku and Kanto, and there are also many earthquakes on the Noto Peninsula in Ishikawa Prefecture. Five earthquakes with a seismic intensity of 3 or higher occurred. (Tally from February 20th to February 26th at 10:00)
Japan: Since 2005, the Kushiro-oki epicenter has experienced a seismic intensity of 5 lower or more
It was the first time in 18 years since January 2005 that an earthquake with a seismic intensity of 5 or more occurred off the coast of Kushiro. The epicenter was slightly deeper than the plate boundary, and is thought to have occurred inside the subducting Pacific plate.
Plate-boundary earthquakes occur frequently off the coast of Kushiro. Recently, an earthquake with a magnitude of 7.1 and a maximum seismic intensity of upper 5 occurred in 2004, injuring more than 50 people. Also, in 1993, an earthquake with a magnitude of 7.5 occurred due to the destruction of the interior of the Pacific plate, causing damage including death. (1993 Kushiro-oki earthquake)
Along the Chishima Trench, there is concern about a huge earthquake occurring at the plate boundary. At the timing of such an earthquake, please check the evacuation route and disaster prevention goods again.
Japan: The central Tokachi region was the epicenter, with a seismic intensity of 3 for the first time in two years.
It will be the first time in about two years since May 2021 that an earthquake with a seismic intensity of 3 or higher centered in the central Tokachi region, and the first time in five months since September last year, even if the area is expanded to the entire Tokachi region. The earthquake is believed to have occurred within the subducting Pacific plate.
Deep earthquakes with a depth of 100 km or more frequently occur in the central to southern Tokachi region, and large earthquakes exceeding magnitude 6 also occur. Recently, in 2013, an earthquake estimated to have a magnitude of 6.5 and a depth of 102 km occurred, and a maximum seismic intensity of 5 upper was observed.
In the Tokachi region of Hokkaido, in addition to the type that occurs at offshore plate boundaries, such as the Tokachi-oki earthquake, there is also the possibility of deep earthquakes like this one and shallow earthquakes caused by the activity of the Tokachi Plain fault zone. is a high-risk area for
World: Tajikistan M6.8 No damage expected
On the morning of the 23rd (Thursday) Japan time, an earthquake estimated to have a magnitude of 6.8 and a depth of about 21 km occurred with an epicenter in the eastern part of Tajikistan in Central Asia. The earthquake mechanism is analyzed as a normal fault type with a tension axis in the east-northeast-west-southwest direction.
In the vicinity of the epicenter, the quake was VII on the revised Mercalli seismic intensity scale.
Although Tajikistan is far from the plate boundary, large earthquakes often occur due to the movement of the Indo-Australian plate against the Eurasian plate.
In 2015, there was an earthquake of magnitude 7.2 near the epicenter of this time, and the shaking caused damage such as death. In addition, Tajikistan was hit by a magnitude 7.5 earthquake in 1949 and a magnitude 7.4 earthquake in 1907, both of which killed more than 10,000 people.
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.
