M7.1 Earthquake near 2024 Hyuganada Sea, Japan Earthquake — August 8, 2024
2024-08-08 07:42:55 UTC (2024-08-08) · approx. 4:42 PM UTC+9 local
Felt by 45 people across nearby locations. Maximum shaking intensity MMI 7.5 (severe).
On August 8, 2024 at 07:42 UTC, a magnitude 7.1 shallow crustal earthquake struck near 2024 Hyuganada Sea, Japan Earthquake, at a depth of 24.0 km and coordinates 31.7599°, 131.5021°. The earthquake was reported felt by 45 peopleacross nearby locations, with a maximum shaking intensity of Modified Mercalli Intensity (MMI) 7.5 (severe). The USGS PAGER system issued a yellow alert level for this event, indicating local impact possible. This earthquake was detected by 252 seismic stations with excellent location accuracy and was assigned a USGS significance rating of 811, making it one of the more significant events of the week. The nearest populated place is Nichinan (population 44,243).
Physical scale: An earthquake of magnitude 7.1 releases seismic energy equivalent to roughly 674 kilotons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 48 km — a useful intuition for the size of the slip patch on the fault.
The epicenter is located in Japan, a region characterized by the intersection of four tectonic plates — Pacific, Philippine Sea, Eurasian, and North American — creating multiple subduction zones. The nearest mapped fault system is the Japan Trench. View all earthquakes in Japan.
Learn more: Magnitude scale · Aftershock sequences
Nearest Populated Places
ShakeMap — predicted shaking intensity
Modeled ground-motion intensity contoured on the Modified Mercalli scale (MMI). Computed by the USGS from the moment-tensor solution and regional ground-motion prediction equations.
Source: U.S. Geological Survey ShakeMap. View interactive ShakeMap on USGS
Did You Feel It? — community-reported shaking
Aggregated felt-report intensity from 45 citizen responses to the USGS Did You Feel It? system. Each colored zone represents the average MMI from reports in that area.
Source: U.S. Geological Survey Did You Feel It?. View on USGS · submit your own report
Population exposure (USGS PAGER)
Estimated population that experienced each level of shaking. Based on the USGS PAGER rapid impact assessment, which combines ShakeMap output with global population grids.
| Shaking intensity (MMI) | Description | Population exposed |
|---|---|---|
| MMI 3 | weak | 6,239,929 |
| MMI 4 | light | 6,572,236 |
| MMI 5 | moderate | 1,559,321 |
| MMI 6 | strong | 904,494 |
| MMI 7 | very strong | 375,530 |
Earthquake Details
131.5021°E
Technical Information
Common Questions
How strong was the magnitude 7.1 earthquake near 2024 Hyuganada Sea, Japan Earthquake?
The magnitude 7.1 earthquake that struck near 2024 Hyuganada Sea, Japan Earthquake on August 8, 2024 at 07:42 UTC had a depth of 24.0 km. It was felt by 45 people with maximum shaking intensity of MMI 7.5 (severe). For context, this was a strong earthquake capable of causing significant damage.
Where did the earthquake occur?
The earthquake epicenter was located at 31.7599°, 131.5021°, which is near 2024 Hyuganada Sea, Japan Earthquake. The nearest populated place is Nichinan (population 44,243). View all earthquakes in Japan.
Were there aftershocks?
Aftershock activity is monitored continuously by the USGS. Aftershock sequences from magnitude 7.1 earthquakes can continue for months to years and gradually diminish over time.
Has Japan had earthquakes this big before?
The largest recorded earthquake in Japan was the M9.1 Tohoku earthquake of March 11, 2011. Today's magnitude 7.1 event is significantly smaller than that historical record.
Actions
Location
Authoritative source: USGS event page (event ID: us6000nith). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2024, August 8, 2024). M7.1 Earthquake near 2024 Hyuganada Sea, Japan Earthquake — August 8, 2024. Retrieved September 8, 2025 from https://www.earthquaketracker.org/earthquakes/event/us6000nith/