Event ID	1584531
Event time	2026-02-28 05:53:57 (UTC)
Local time	2026-02-27 20:53:57 - [It was evening in the affected area.]
Last update	2026-02-28 06:11:36 (UTC)
Magnitude	5.4
Depth	35 km
Class	Moderate
Hypocenter	Shallow depth
Mercalli scale	6
Possible effects	Everyone feels movement. People have trouble walking. Objects fall from shelves. Pictures fall off walls. Furniture moves. Plaster in walls might crack. Trees and bushes shake. Damage is slight in poorly built buildings. No structural damage.
Data status	reviewed
Data provider	USGS

Continent	Asia
Country	Japan
Administration area	Okinawa
Nearest settlement	Hirara
Distance	43 km
Course	NW
Surface type	underwater quake
Tsunami region	North Pacific
Water surface name	Eastern China Sea

Nearest nuclear power plants

There is no known nuclear power plant nearby.

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Nearest marine ports

Hirara Ko (42,51 km), Hirara Ko (42,51 km), Ishigaki (126,14 km), Ishigaki (126,14 km)

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Nearest airports

Shimojishima Airport (34,23 km), Shimojishima Airport (34,23 km), Miyako Airport (44,75 km), Miyako Airport (44,75 km), Tarama Airport (65,29 km)

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Nearest volcanoes

Submarine Volcano NNE of Iriomotejima volcano (129,91 km)

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Quick Analysis

According to the epicenter of the quake, this is an underwater quake. Based on the hypocenter, an underwater landslide is conceivable and could trigger a tsunami. Based on the data received, using the depth of the hypocenter, a potential tsunami will reach the nearest (Hirara, Okinawa, Japan) settlement within 00:32. (PLEASE NOTE: THIS IS AN ESTIMATE ONLY!)