Location:

Period:

27 Jun 2022 20:06:59 - 28 Jun 2022 15:01:24 (18 hours 54 minutes)

Volcanoes in 100km radius:

None

Earthquakes:

M 7.0+:

M 7.1; 30 km SW of Hengchun, Taiwan; (26 Dec 2006) (18km from the swarm center)

5 swarms found nearby.

2006

PS20061009.2(157.9km)

9 Oct

1 hours

9 earthquakes

PS20061011.1(142.2km)

10 Oct

16 hours

8 earthquakes

PS20061226.1(7.0km)

26 Dec

14 hours

7 earthquakes

2022

PS20220322.1(195.7km)

22 Mar

2 hours

7 earthquakes

PS20220918.1(170.3km)

17 Sep

1 day 12 hours

11 earthquakes

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Seismic Swarm Activity in Taiwan Region: June 2022 Event

A seismic swarm designated PS20220628.1 was recorded in the Taiwan region, commencing at 20:06 on 27 June 2022 and concluding at 15:01 on 28 June 2022. Over this 18-hour 54-minute interval, five earthquakes occurred, providing insight into clustered seismic behavior within an active tectonic setting.

The sequence began with two events of magnitude 5.0 at a depth of 10 km on 27 June at 20:06:59 and 22:03:21. Activity resumed on 28 June with another magnitude 5.0 event at 13:34:58 (10 km depth), followed by a magnitude 5.3 event at 13:43:28 (10 km depth). The swarm concluded with a magnitude 3.8 event at 15:01:24 (33 km depth). These events reflect typical swarm characteristics, featuring closely spaced occurrences without a dominant mainshock-aftershock pattern.

Taiwan occupies a complex tectonic zone where the Philippine Sea Plate converges with the Eurasian Plate, resulting in frequent seismic activity across the island and surrounding waters. This interaction drives both shallow crustal events and deeper subduction-related seismicity. The swarm's location aligns with areas influenced by this plate boundary, consistent with the region's established geological framework.

Historical records since 1 January 2000 indicate four swarms in the Taiwan region. Prior activity includes three swarms in 2006 and one in 2022. A notable strong earthquake of magnitude 7.1 occurred on 26 December 2006, approximately 30 km southwest of Hengchun and 18 km from the 2022 swarm center, underscoring the area's capacity for significant events amid ongoing swarm occurrences.

Such swarms contribute to understanding local stress accumulation and release along fault systems shaped by regional plate motions. Continued monitoring supports assessment of seismic hazards in this dynamic environment.

References

SeismoSight internal swarm classification records.
USGS Earthquake Catalog for regional tectonic context.
Central Weather Administration, Taiwan, historical seismicity summaries.