M5.5 Earthquake in the Taiwan region — September 17, 2022
2022-09-17 14:45:27 UTC (2022-09-17) · approx. 10:45 PM UTC+8 local
Felt by 6 people across nearby locations. Maximum shaking intensity MMI 6.6 (very strong).
On September 17, 2022 at 14:45 UTC, a magnitude 5.5 shallow crustal earthquake struck in the Taiwan region, at a depth of 10.0 km and coordinates 22.9547°, 121.2227°. The earthquake was reported felt by 6 peopleacross nearby locations, with a maximum shaking intensity of Modified Mercalli Intensity (MMI) 6.6 (very strong). The USGS PAGER system issued a green alert level for this event, indicating no significant casualties or damage expected. This earthquake was detected by 54 seismic stations with excellent location accuracy and was assigned a USGS significance rating of 469, placing it among routine seismic activity. The nearest populated place is Taitung (population 0).
Physical scale: An earthquake of magnitude 5.5 releases seismic energy equivalent to roughly 3 kilotons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 3.8 km — a useful intuition for the size of the slip patch on the fault.
The epicenter is located in Taiwan, a region characterized by the collision of the Luzon volcanic arc with the Eurasian continental margin, where the Philippine Sea Plate converges at 80 mm per year. View all earthquakes in Taiwan.
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 6 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 | 6,101,292 |
| MMI 4 | light | 6,959,357 |
| MMI 5 | moderate | 140,468 |
| MMI 6 | strong | 31,069 |
Earthquake Details
121.2227°E
Technical Information
Nearby Earthquakes (Last 7 Days)
Common Questions
How strong was the magnitude 5.5 earthquake in the Taiwan region?
The magnitude 5.5 earthquake that struck in the Taiwan region on September 17, 2022 at 14:45 UTC had a depth of 10.0 km. It was felt by 6 people with maximum shaking intensity of MMI 6.6 (very strong). For context, this was a moderate earthquake that could be widely felt.
Where did the earthquake occur?
The earthquake epicenter was located at 22.9547°, 121.2227°, which is in the Taiwan region. The nearest populated place is Taitung (population 0). View all earthquakes in Taiwan.
Were there aftershocks?
Aftershock activity is monitored continuously by the USGS. Aftershock sequences from magnitude 5.5 earthquakes can continue for days to weeks and gradually diminish over time.
Has Taiwan had earthquakes this big before?
The largest recorded earthquake in Taiwan was the M7.6 Chi-Chi earthquake of September 21, 1999. Today's magnitude 5.5 event is significantly smaller than that historical record.
Authoritative source: USGS event page (event ID: us7000i8v9). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2022, September 17, 2022). M5.5 Earthquake in the Taiwan region — September 17, 2022. Retrieved November 26, 2022 from https://www.earthquaketracker.org/earthquakes/event/us7000i8v9/