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2020/05/10 10:04 Weather News
In the past week, the number of earthquakes observed in Japan has been low compared to the previous week. On the other hand, the number of earthquakes with a seismic intensity of 3 or more increased to 6 times. (Aggregation from May 4 to 10, 10:00)
The first event occurred on the 4th (Monday) at 22:07 in the northeast part of Chiba Prefecture with a magnitude of 5.6, and only 30 minutes later, a magnitude of 4.4 off the coast of Ibaraki Prefecture. Magnitude 5.0 occurred in the northwestern part of Chiba Prefecture at 1:57 on 6 (Wednesday) after the date changed to midnight the next day, with a maximum seismic intensity of 4 twice and a maximum seismic intensity of 3 once in less than 30 hours. Has occurred
Early earthquake alerts have been announced for the two earthquakes centered in Chiba prefecture.
These earthquakes are considered to have occurred near the boundary where the Pacific plate is submerged in the North American plate due to depth and mechanism of occurrence.
There are many earthquakes in this area, and there have been a few cases of frequent 5 magnitude earthquakes around this time. Between December 3 and 5, 2019, there were four earthquakes with a maximum seismic intensity of 3 or more, with epicenters in the northern and southern prefectures of Ibaraki. This earthquake is also considered to be within the normal range of increase and decrease.
At this stage, it is difficult to predict the occurrence of future large earthquakes from such earthquakes, and it is essential to be regularly prepared.
The largest is a 6.8 magnitude earthquake that occurred in the Banda Sea, Indonesia on 6 (Wednesday). Since the depth was about 100 km, there was no damage or tsunamis caused by the tremor.
On the other hand, Iran suffered damage despite its small scale. An earthquake of magnitude 4.6 occurred a little east of the capital city of Tehran on 8 (Friday), and the depth of the epicenter was as low as 10 km, so the tremor was strong near the epicenter and I feel the tremor in Tehran . Due to the strong tremor, some buildings near the epicenter were damaged and two people died.
The northern part of Iran, including Tehran, is close to the boundary between the Eurasian plate and the Arab plate, and many major earthquakes occur. A 6.3 magnitude earthquake struck in 2004, killing more than 30 people.
* Information on the epicenter and intensity in Japan comes from the Japan Meteorological Agency, unless otherwise stated. If there is no particular description of epicenters abroad, consult the United States Geological Survey (USGS). Epicenter information may vary by publishing agency.
