M3.8 Earthquake – RYUKYU ISLANDS, JAPAN
A minor magnitude 3.8 earthquake struck near RYUKYU ISLANDS, JAPAN at a depth of 91.2 km (intermediate focal zone), releasing seismic energy equivalent to approximately 8 tons of TNT. Here is the verified NEIC telemetry, interactive epicenter map, and ground shaking assessment.
Seismic Telemetry Specifications
3.8M
Minor Seismic Class
91.2km
Upper Mantle
28.588° N, 129.137° E
GPS Coordinates
8 tons
TNT Equivalent Power
NEIC
USGS Real-time Feed
Epicenter Location & Tectonic Fault Map
Is This Earthquake Dangerous?
A magnitude 3.8 event is classified as a minor earthquake. Often felt by people indoors, especially on upper floors. Hanging objects may swing slightly; structural damage is extremely rare.
Estimated Shaking Across Nearby Communities
The epicenter occurred in a remote or offshore marine sector with no major population centers situated within the primary ground shaking perimeter.
Did You Feel This Earthquake?
Help seismologists and community members map real-world ground shaking near Japan.
Your immediate response verifies shaking boundaries and helps ground-truth instrumental models.
What Does Magnitude 3.8 Mean?
Earthquake strength is measured on a logarithmic scale. Compare this event with the full seismic scale:
Logarithmic Energy Multiplier
Because seismic scales are logarithmic, each whole integer increase represents:
Why Did This Earthquake Happen?
Japan sits at the complex collision intersection of four major tectonic plates: the Pacific, Philippine Sea, Eurasian, and North American plates. Subduction of the Pacific Plate beneath the Japanese archipelago creates intense strain that releases as high-frequency megathrust earthquakes and volcanic activity along the Pacific Ring of Fire.
Originating at a depth of 91.2 km (Upper Mantle / Wadati-Benioff Zone (70–300 km)), this rupture occurred originated within the descending oceanic plate inside the upper mantle. shaking radiates over a wider geographic area with attenuated high frequencies.
Aftershock Outlook & Secondary Tremors
Seismologists note that minor aftershocks remain common in the 24 to 48 hours following tremors of magnitude 3.8. According to statistical seismic models, there is roughly a 5% probability of a subsequent event of equal or greater strength occurring in the same fault zone. Residents in Japan are advised to check living spaces for unsecured items.
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Earthquake Safety Action Plan
Complete Safety Guide →- •Drop, Cover, and Hold On: Take cover beneath a sturdy table or desk.
- •Stay indoors away from exterior glass windows and heavy unanchored fixtures.
- •If outdoors, move into an open area away from power lines and building facades.
- •Inspect utilities for damaged gas lines, water leaks, or electrical hazards.
- •Expect Aftershocks: Secondary tremors frequently strike after significant events.
- •Avoid damaged structures and listen to official emergency broadcasts.
- •Maintain a 72-hour emergency go-bag with water, food, and first aid.
- •Anchor heavy furniture, water heaters, and appliances to structural studs.
- •Establish a family emergency communication protocol and meeting point.
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