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Note:This page contains AI-generated content for informational and entertainment purposes only. It may contain inaccuracies. Raw event data is from USGS and EMSC. All statistics, lists, and derived information are generated by this site. Full disclaimerFound an error?
Location:
6 km SSW of Indios, Puerto Rico
Period:
23 Apr 2022 10:11:08 - 10 May 2022 21:26:31 (17 days 11 hours 15 minutes)
Volcanoes in 100km radius:
None
Earthquakes:
189
20 swarms found nearby.
2018
S20181215.1(27.9km)
14 Dec
4 days 6 hours
109 earthquakes
2019
28 Dec
244 days 6 hours
9147 earthquakes
2020
S20200107.1(13.4km)
7 Jan
1 day 21 hours
53 earthquakes
1 May
2 days 18 hours
36 earthquakes
S20201007.2(20.2km)
6 Oct
22 days 9 hours
229 earthquakes
17 Nov
35 days 20 hours
447 earthquakes
23 Dec
46 days 11 hours
2842 earthquakes
2021
S20210108.1(11.2km)
7 Jan
13 days 20 hours
148 earthquakes
S20210130.1(15.3km)
29 Jan
2 days 1 hours
29 earthquakes
24 Jun
6 days 15 hours
127 earthquakes
S20210718.1(12.6km)
17 Jul
3 days 1 hours
37 earthquakes
2022
1 Feb
37 days 20 hours
630 earthquakes
S20220322.1(12.6km)
21 Mar
19 days 5 hours
207 earthquakes
S20220806.1(11.5km)
5 Aug
13 days 6 hours
262 earthquakes
2023
14 Mar
6 days 9 hours
92 earthquakes
8 Apr
10 days 15 hours
189 earthquakes
S20231001.1(11.9km)
30 Sep
3 days 22 hours
63 earthquakes
S20231024.1(11.8km)
23 Oct
1 day 13 hours
25 earthquakes
2025
S20250312.1(16.1km)
12 Mar
4 days 6 hours
74 earthquakes
S20250320.3(17.7km)
20 Mar
5 days 23 hours
70 earthquakes
AI-generated article — for informational and entertainment purposes only. May contain inaccuracies. Full disclaimerFound an error?

Seismic Swarm S20220424.1: Analysis of Earthquake Activity Near Indios, Puerto Rico

Seismic swarm S20220424.1 was recorded in the region 6 km SSW of Indios, Puerto Rico. The sequence began at 10:11 on 23 April 2022 and concluded at 21:26 on 10 May 2022, spanning 419 hours and 15 minutes. During this interval, a total of 189 earthquakes were registered. Puerto Rico lies at the northeastern edge of the Caribbean plate, where it interacts with the North American plate along the Puerto Rico Trench. This tectonic setting produces frequent seismic activity, including both individual events and clustered swarms. The island's geology features a complex assemblage of volcanic, sedimentary, and metamorphic rocks shaped by millions of years of plate convergence and associated deformation. Analysis of the first 100 events reveals a typical swarm pattern dominated by low-to-moderate magnitudes. The recorded events ranged from magnitude 1.3 to 3.4, with the majority falling between 1.7 and 2.8. Depths were generally shallow, concentrated between 7 km and 18 km, consistent with crustal seismicity in the overriding Caribbean plate. The highest magnitude event (3.4) occurred early in the sequence on 23 April at a depth of 10 km. Subsequent activity showed no clear migration in depth or epicenter, indicating a localized source volume. Temporal distribution indicates peak activity on 23 and 24 April, followed by a gradual decline through early May. Many events clustered within short time windows, a hallmark of swarm behavior driven by fluid migration or aseismic slip rather than a single mainshock-aftershock sequence. Since 1 January 2000, Puerto Rico has experienced 13 documented swarms. These occurred in the following yearly counts: one in 2018, one in 2019, five in 2020, four in 2021, and two in 2022. This distribution suggests episodic swarm activity superimposed on the region's background seismicity. The swarm data originate from SeismoSight internal classification. Geological context is drawn from established tectonic studies of the northeastern Caribbean.

References

USGS Earthquake Hazards Program reports on Puerto Rico seismicity.
SeismoSight internal swarm catalog.