Noto Region of Ishikawa Prefecture Reports Three Magnitude 3 Earthquakes in Weekly Seismic Report for April 2nd, 2023 – Weather News

The number of felt earthquakes in Japan has slightly increased compared to the previous week, with earthquakes being noticeable on the Pacific side of Tohoku and in Hokuriku. Seven earthquakes with a seismic intensity of 3 or higher have occurred from March 27th to April 2nd at 10:00.

In the Noto region of Ishikawa Prefecture, an earthquake estimated to have a magnitude of 4.1 and a depth of 13 km occurred on March 29th with a maximum seismic intensity of 3 observed in Suzu City, Ishikawa Prefecture, and a seismic intensity of 2 in Noto Town. Two additional earthquakes with a magnitude of 3.5 and 3.4 and a depth of 13km each occurred on the same day with a maximum seismic intensity of 3 observed in Suzu City. The Noto region has been experiencing frequent earthquakes since 2021, with active activity since the beginning of the year.

Shallow earthquakes occur inside the Philippine Sea plate, while deep earthquakes occur near the boundary where the Pacific plate subducts into the Philippine Sea plate. Larger earthquakes are more noticeable off the east coast of Hachijojima than in the waters near Hachijojima.

On April 1st, an earthquake with a magnitude of 5.0 and an estimated depth of regarding 10km occurred off the coast of Shimoetsu, Niigata Prefecture. In this earthquake, a maximum seismic intensity of 3 was observed in Niigata City, Sado City, Yamagata Prefecture, Nakayama Town, Oguni Town, etc.

On January 18th, an earthquake estimated to have a magnitude of 5.4 and a depth of regarding 30 km occurred with an epicenter in Hyuga-nada, with a maximum seismic intensity of 4 observed in Miyazaki City and Nichinan City. This is the first earthquake with a seismic intensity of 4 or higher with its epicenter in Hyuga-nada since January 22, 2018.

According to the US Geological Survey analysis, there have been three earthquakes with a magnitude of 6 or higher worldwide. The largest quake of magnitude 6.3 occurred off the coast of Chile.

2023/04/02 10:07 Weather News

The number of felt-earthquakes observed in Japan over the past week is slightly higher than the previous week.

Earthquakes were conspicuous on the Pacific side of Tohoku and in Hokuriku. Seven earthquakes with a seismic intensity of 3 or higher have occurred. (Tally from March 27th to April 2nd at 10:00)

Japan: A series of seismic intensity 3 earthquakes in the Noto region

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Earthquake in the Noto region of Ishikawa Prefecture

Japan: Earthquake off the coast of Shimoetsu, Niigata Prefecture, with a seismic intensity of 3 for the first time in four years

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Shimoetsu offshore earthquake in Niigata Prefecture

World: M6.3 off the coast of Chile, South America

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Earthquakes of M4.5 or higher around the world (quoted from USGS website/processed by Weathernews)

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.



As we keep a close eye on seismic activity around the world, recent earthquakes in Japan and off the coast of Chile serve as reminders of the ever-present threat of natural disasters. With ongoing seismic activity in the Noto region of Ishikawa Prefecture and Hyuga Nada, it is important for residents to remain prepared for strong tremors. Meanwhile, the lack of significant seismic activity in Chile in recent years may have led to complacency, but the recent M6.3 earthquake serves as a warning to remain vigilant. Let us all stay informed and prepared for any potential seismic events, and prioritize the safety and wellbeing of ourselves and those around us.

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