What was the estimated magnitude and maximum seismic intensity of the first earthquake that occurred in Nagano Prefecture?

The first earthquake had an estimated magnitude of 5.0 and a maximum seismic intensity of upper 5.

What was the estimated magnitude of the second earthquake that followed at around 2:54 PM?

The second earthquake had an estimated magnitude of 5.1 and caused a lower 5 intensity in Nagano City and Omachi City.

Is there any danger of a tsunami resulting from either of the two earthquakes in Nagano Prefecture?

According to the reports, neither of the two earthquakes poses any tsunami threat.

Where were the epicenters and what was the depth of both earthquakes according to the JMA?

The epicenters were located in northern Nagano Prefecture, at a depth of approximately 10 kilometers.

Which cities in Nagano Prefecture observed a maximum seismic intensity of lower 5 during the second earthquake?

Nagano City and Omachi City in Nagano Prefecture observed a maximum seismic intensity of lower 5.

Earthquake Again in Nagano, Japan; Estimated Magnitude 5.1, No Tsunami Threat

Published Apr 18, 2026 3:39 PM ・ Updated Jun 17, 2026 1:28 PM ・ 3 min read ・ Source: CNA (Central News Agency)

Two consecutive earthquakes struck northern Nagano Prefecture on the afternoon of the 18th. The second tremor, an estimated magnitude 5.1, reached a seismic intensity of lower 5 in Nagano City and Omachi City, but poses no tsunami threat.

(Central News Agency, Tokyo, 18th, Comprehensive Foreign Dispatch) An earthquake with an estimated magnitude of 5.0 and a maximum seismic intensity of upper 5 occurred in Nagano Prefecture, Japan, at approximately 1:20 PM today. It was followed by another earthquake at around 2:54 PM, with an estimated magnitude of 5.1. A maximum seismic intensity of lower 5 was observed in Nagano City and Omachi City. Neither earthquake poses a tsunami threat.

According to a report by the Japan Broadcasting Corporation (NHK), observations by the Japan Meteorological Agency (JMA) indicate that the epicenters of both earthquakes were located in northern Nagano Prefecture, at a depth of about 10 kilometers.

During the earthquake at approximately 2:54 PM (1:54 PM Taipei time), a maximum seismic intensity of lower 5 was observed in Nagano City and Omachi City, Nagano Prefecture. Shaking with an intensity of 4 was measured in Ikusaka Village, Matsukawa Village, and Ogawa Village in Nagano Prefecture, while an intensity of 3 was observed in Matsumoto City, Suwa City, Chino City, and Azumino City in Nagano Prefecture.

A wide area, including the Kanto-Koshinetsu region, Tokai region, and Hokuriku region, also experienced shaking ranging from seismic intensity 1 to 2.

Stand with facts; every sponsorship from you is a power to protect press freedom. Download the CNA APP to grasp the latest news instantly. The text, images, and audio/video of this website may not be reproduced, broadcast, or publicly transmitted and utilized without authorization.

FACT BOX

Source: CNA (Central News Agency)
Category: Taiwan
Organizations: NHK

Earthquake Again in Nagano, Japan; Estimated Magnitude 5.1, No Tsunami Threat

⚡ Key Points

FACT BOX

Editorial & Verification Standards

FAQ

Cite this article — HOW TO CITE

AI CRAWLER ACTIVITY