2022/12/04 10:17 Weather News
Earthquakes are prominent in the Kanto region, and there are many earthquakes in the Noto Peninsula in Ishikawa Prefecture. There were two earthquakes with a seismic intensity of 3 or higher. (November 28th to December 4th at 10:00)
Japan: The number of felt earthquakes increased in Noto Peninsula, Ishikawa Prefecture in November
The earthquake in the Noto region of Ishikawa Prefecture has continued seismic activity since last spring. There were 15 felt earthquakes in November, an increase compared to October. An earthquake with a maximum seismic intensity of 4 also occurred on November 14, and the activity is somewhat active.
Although this activity is believed to be related to fluids distributed underground, the detailed mechanism is not clearly understood at this time. There is no tendency for the activity to slow down, so beware of strong tremors in Suzu City, which is close to the epicenter.
Epicenters where irregular seismic regions are likely to appear
Besides the southeastern offshore of Mie Prefecture, similar deep earthquakes often occur in the Sea of Okhotsk, the Sea of Japan, the southern offshore Tokaido, and the sea near Torishima, and once every few years, an earthquake with a magnitude of 6 or more also occurs happening.
Even if the tremors were small near the epicenter, strong tremors were transmitted far away. Mie Prefecture, which is close to the epicenter, had no locations where felt earthquakes were observed, and the highest seismic intensity was observed from 4 in Ibaraki and Fukushima prefectures. A large-scale earthquake can cause tremors greater than seismic intensity 5 below, so caution is needed.
Domestic: Ishikawa Prefecture, Noto Peninsula earthquake with seismic intensity 4
This was the first time in about a month and a half since September 25 for an earthquake with a seismic intensity of 3 or more with an epicenter in the Noto region. However, during that period, felt earthquakes continued to occur, with 8 earthquakes in October and 6 in November prior to this earthquake.
There are currently no signs that the activity will subside, and strong tremors may continue in Suzu City, which is close to the epicenter. Continue to pay attention to seismic activity.
There have been earthquakes as large as M6.0 in the past.
Most of the earthquakes are concentrated at a depth of about 10 km even at the depth of the east-west cross section. There are not many events at depths of 20 km or more, but there are some at depths of 100 km or more. Earthquakes that occur near the boundary between the Pacific plate and the Eurasian plate or within the Pacific plate.
Most deep earthquakes are around magnitude 4, but in May 2014, a large earthquake occurred with a magnitude of 6.0. In this earthquake, a maximum seismic intensity of 5 lower was observed in Chiyoda Ward, Tokyo, and a seismic intensity of 3 to 4 was observed in a wide area of the Kanto region, causing damage such as injuries.
World: Areas with few M5.3 earthquakes in inland Canada
On the morning of November 30 (Wednesday) Japan time, an earthquake with an estimated magnitude of 5.3 and a depth of about 10 km occurred in inland Canada. The earthquake mechanism is analyzed as a type of reverse fault with a pressure axis in the north-northeast-south-southwest direction. Although it is believed that there was a strong tremor near the epicenter, it was far from the residential area, so there was no particular effect.
Most of the earthquakes that occur in Canada occur on the west coast near the boundary between the Pacific and North American plates. There are very few earthquakes in inland areas, and an earthquake with a magnitude of 4.5 or greater that occurred near the epicenter this time dates back to 2015. Although earthquakes greater than magnitude 5 have occurred from time to time together, it is a region where large-scale earthquakes that cause major damage are unlikely to occur.
M6.1 in north-west Turkey, an area with large earthquakes in the past
Turkey is located on a huge bedrock called the Eurasian Plate. It is an area where deformation energy tends to accumulate in the bedrock, such as the boundary between the African plate and the Arabian plate. For this reason, there are many faults in Japan, and the earthquake that occurred on the 23rd is believed to have occurred near the North Anatolian fault.
Turkey, which is located on a plate boundary and is seismically active like Japan, has had more than 100 fatal earthquakes since 1900, and similar to this time, the earthquake occurred near the North Anatolian Fault. 1999, a large earthquake with magnitude. of 7.6 called “Izmit Earthquake” 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 stated. Foreign epicenter information is from the United States Geological Survey (USGS) unless otherwise noted. There may be differences in hypocenter information depending on the issuing institution.
