M5.5 Earthquake in Southern Ibaraki Prefecture Accurately Predicted by 'MEGA Earthquake Prediction'

The Japan Earthquake Science Exploration Agency (JESEA), operating within stepdays Inc. (Shibuya, Tokyo; representative: Toshihiro Kitta), which provides the earthquake prediction service 'MEGA Earthquake Prediction,' issued the following forecast in its special edition released on May 11, 2026.

MEGA Earthquake Prediction: https://www.jesea.co.jp/

Special Edition Released May 11, 2026

Area: Surrounding the Kanto-Koshin region

Timing: By June 17

Magnitude: M5.5 ± 0.5

【Accurate Prediction of M5.5 Earthquake with Maximum Intensity of 5-Lower】

As a result, an earthquake registering a maximum seismic intensity of 5-lower (magnitude 5.5) occurred on June 16, 2026. JESEA's prediction matched the actual earthquake in terms of location, timing, and magnitude.

This successful prediction was originally published as a 'Pinpoint Prediction' within the weekly 'MEGA Earthquake Prediction' service, but was issued as a special edition bulletin on this occasion.

The 'Pinpoint Prediction' forecasts the occurrence of an earthquake of magnitude 6 or higher within one month at a specific location.

The 'Pinpoint Prediction' leverages JESEA's proprietary advanced technologies, including patented methods, integrating comprehensive analysis of over 10 types of precursory phenomena to enhance prediction accuracy.

In 2024, 23 out of 29 predictions were accurate, achieving a hit rate of 79.3%. In 2025, 18 out of 21 predictions were accurate, achieving a hit rate of 85.7%.

Thus, the 'Pinpoint Prediction' has consistently demonstrated high accuracy in forecasting earthquake occurrences.

We hope this Pinpoint Prediction continues to support disaster preparedness for many people.

【MEGA Earthquake Prediction】

A paid subscription service delivering earthquake forecasts every Wednesday, priced at 380 yen per month (tax included).

Available via web service, mobile app, Foomii, and Mag2 newsletter.

The Mag2 newsletter version is priced at 520 yen per month (tax included).

Web version: https://megajishin.com/?infl_id=pre20250704

iOS app: https://apps.apple.com/jp/app/mega%E5%9C%B0%E9%9C%87%E4%BA%88%E6%B8%AC/id1252972115

Android app: https://play.google.com/store/apps/details?id=jp.jesea.mega.earthquake.prediction&pli=1

Foomii Web: https://foomii.com/00234

Foomii Newsletter: https://foomii.com/00087

Mag2 Newsletter: https://www.mag2.com/m/0001592103

【Company Overview】

Company: Japan Earthquake Science Exploration Agency (within stepdays Inc.)

Representative: Toshihiro Kitta

Headquarters: 2F Business Airport Ebisu, 1-19-19 Ebisu, Shibuya-ku, Tokyo

Founded: January 17, 2013

Business: Earthquake prediction services / Information distribution services

URL: https://www.jesea.co.jp