Deep magnitude 6.0 quake recorded off Shima; local effects unclear

The U.S. Geological Survey recorded the earthquake at 7:15:02 a.m. Japan Standard Time on Sunday, November 1, 2026. Its epicenter was 58 kilometers south-southeast of Shima, in Mie Prefecture, and its origin was 352.4 kilometers below the surface. In UTC, the earthquake occurred at 22:15:02 on October 31—the same instant, on the previous calendar day.⁠1

Those two distances describe different things. The 58-kilometer figure locates the epicenter—the point on the surface above where the earthquake began—relative to Shima. The much larger figure describes how far down it began. Neither is a measurement of the shaking experienced by someone in the city.⁠1

The available USGS entry lists the magnitude as 6.0, using the mww designation, and marks the earthquake reviewed rather than preliminary. It carries an update time of 7:30:14 a.m. in Japan. That is the recorded update, not a guarantee that no later revision occurred: the live event details could not be independently rechecked for this report.⁠1

Magnitude measures an earthquake’s size. Seismic intensity addresses a different, more immediate question: how strongly the ground shook at a particular location. A magnitude alone cannot supply that local picture, and the depth figure cannot stand in for observations from Shima or neighboring communities.

The Japan Meteorological Agency’s earthquake information includes locations recording seismic intensity 1 or higher and their measured intensities. But no event-specific set of those readings has been established for this earthquake in the material available for this report. The missing measurements matter because they would describe what actually reached the surface, rather than require residents to infer it from the headline magnitude.⁠15⁠10

There is a potentially relevant Japanese account. Kyodo, in a report published by Okinawa Times, described an earthquake at about 7:15 a.m. on November 1 off southeastern Mie. It attributed an estimated magnitude of 6.1 and a depth of about 350 kilometers to the JMA, and reported no tsunami concern. Its broad timing and location resemble the USGS account.⁠20

That resemblance is not enough to confirm the match. The Kyodo report does not supply the USGS event identifier, the exact second of origin or the same distance-and-direction description from Shima. Its 6.1 estimate therefore should not be presented as a confirmed revision of the reviewed USGS magnitude of 6.0. Nor has the underlying, timestamped Japanese bulletin been independently established for this event.⁠20⁠1

The USGS entry carries no tsunami flag and lists its PAGER impact-alert level as none. Those are fields in that record, not findings that Japanese authorities issued no warning or advisory. They also do not establish that no sea-level disturbance occurred or that people and buildings were unharmed.⁠1

The distinction is consequential. JMA’s own guidance separates “no tsunami concern” from the possibility of slight sea-level changes without concern about damage. An event-specific bulletin is needed to say which assessment, if either, applies here. The reported Kyodo assessment is relevant evidence, but it is not a substitute for a confirmed matching official bulletin.⁠15⁠20

There is likewise no established event-specific confirmation of injuries, building damage, transport disruption or a local emergency response. The available USGS record provides no casualty or damage information, and the Kyodo account does not establish those outcomes. That leaves impacts unconfirmed; it does not turn them into zero.⁠1⁠20

The answer to the opening question is therefore still incomplete. A deep offshore earthquake has been recorded, but its consequences on land remain unsettled. The next consequential evidence is not another reading of the magnitude: it is a matching Japanese earthquake and tsunami bulletin, measured local shaking, and assessments of whether communities suffered harm or disruption.