Seismologists say it is “unclear” whether recent earthquakes are related

Tokyo and other areas in the Kanto region have been hit by a handful of earthquakes in recent months that originated in the same area, raising questions about what was going on beneath the surface.

Officials recorded a tremor of 3 on the Japanese seismic intensity scale of 7 in Tokyo’s 23 wards, as well as in nearby Ibaraki, Saitama, Chiba and Kanagawa prefectures, when an earthquake struck at 10:29 p.m. on April 4.

Two minutes later, people felt another earthquake with a maximum intensity of 2 wingspan and across Yokohama.

The Japan Meteorological Agency said the two quakes originated in Chiba Prefecture, northwest of the country.

The northwestern part of the county was also shaken by an earthquake at 8:52 pm on March 31. The epicenter was located in Tokyo Bay off the prefecture, and officials noted a maximum intensity of 4 in the Hanamigawa district of Chiba.

The depth of the focus of these earthquakes was 60-73 km, not far from the surface of the earth.

The earthquake with a maximum intensity of 5 in the Adachi Ward district of Tokyo and Kawaguchi in Saitama Prefecture on October 7 was similar to the recent earthquakes in terms of its focus. The October 7 earthquake caused the Nippori-Tonyri Liner carriages to derail in the capital.

These tremors all hit the same area, raising questions about whether they are related to each other.

This remains “unclear,” a weather agency official said, but added that the region from which the recent earthquake wave originated has historically been home to a large number of earthquakes.

For example, three strong earthquakes of magnitude 6.0 or greater shook the region in the 1950s. Similar earthquakes struck there in 1980 and 2005.

“People may have the impression that earthquakes occur more frequently than before because recent earthquakes struck in quick succession,” the official said.

The Kanto region is prone to earthquakes, as the boundaries of the tectonic plates under it have a complex structure.

The Philippine Sea Plate is sinking under the North American Plate. The Pacific plate descends under the Philippine sea plate.

Although the epicenter of the earthquake last fall and in recent weeks is near each other, how it occurred varies, according to the agency.

Agency officials believe the two earthquakes this month occurred in the Philippine Sea Plate, while one originated in October and another in late March between the Philippine Sea Plate and Pacific Plate boundaries.

In addition, the Kanto region can be shaken by an earthquake that strikes outside the region.

For example, Tokyo’s 23 wards registered an intensity of 4 when the earthquake struck Fukushima Prefecture on March 16. It was an earthquake that originated in the Pacific Plate. High No. 6 was observed in Fukushima and Miyagi Prefectures of the earthquake.

The Great Kanto Earthquake of 1923, with a magnitude of 7.9 and leaving 105,000 dead, struck between the boundaries of the Pacific Plate and the Philippine Sea Plate.

This boundary slip was observed slowly in 2018, with notable tremors being felt throughout the Kanto region.

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