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Location:
Island of Hawaii, Hawaii
Period:
2 Sep 2019 23:04:48 - 4 Sep 2019 10:42:31 (1 day 11 hours 37 minutes)
Volcanoes in 100km radius:
Kilauea(2km), Mauna Loa(36km), Mauna Kea(49km), Kama'ehuakanaloa(55km), Hualalai(70km)
Earthquakes:
58
115 swarms found nearby.
2000
23 Feb
8 days 11 hours
216 earthquakes
24 Apr
2 days 22 hours
63 earthquakes
5 May
7 days 4 hours
212 earthquakes
2001
VS20010521.1(12.8km)
20 May
1 day 11 hours
28 earthquakes
2003
23 Jun
2 days 20 hours
43 earthquakes
12 Jul
1 day 19 hours
34 earthquakes
15 Jul
1 day 6 hours
31 earthquakes
4 Aug
1 day 22 hours
31 earthquakes
VS20030809.1(12.7km)
8 Aug
7 days 14 hours
101 earthquakes
18 Nov
3 days 20 hours
64 earthquakes
VS20031206.1(22.7km)
5 Dec
3 days 21 hours
63 earthquakes
10 Dec
3 days 20 hours
97 earthquakes
2004
12 Jan
18 hours
25 earthquakes
2 Nov
1 day 1 hours
30 earthquakes
VS20041110.1(26.0km)
9 Nov
24 days 3 hours
334 earthquakes
14 Dec
1 day 0 hours
32 earthquakes
22 Dec
2 days 4 hours
32 earthquakes
2005
24 Jan
15 days 23 hours
208 earthquakes
2006
VS20060202.1(11.3km)
1 Feb
35 days 15 hours
821 earthquakes
VS20060312.1(13.6km)
11 Mar
3 days 5 hours
41 earthquakes
2007
24 May
10 days 11 hours
114 earthquakes
17 Jun
14 days 13 hours
411 earthquakes
S20070704.1(15.6km)
3 Jul
18 days 14 hours
216 earthquakes
S20070814.1(23.0km)
13 Aug
7 days 4 hours
87 earthquakes
2008
4 Dec
28 days 3 hours
473 earthquakes
2011
3 Feb
14 days 16 hours
387 earthquakes
S20110223.1(18.3km)
22 Feb
5 days 0 hours
117 earthquakes
1 Mar
7 days 9 hours
325 earthquakes
2012
22 Feb
3 days 4 hours
80 earthquakes
28 May
5 days 8 hours
67 earthquakes
4 Jun
4 days 4 hours
37 earthquakes
24 Oct
10 days 1 hours
134 earthquakes
2013
13 Jan
4 days 3 hours
63 earthquakes
2014
17 Feb
3 days 0 hours
53 earthquakes
13 May
4 days 23 hours
58 earthquakes
2015
23 Feb
3 days 17 hours
72 earthquakes
22 Apr
25 days 2 hours
2099 earthquakes
15 Oct
3 days 4 hours
45 earthquakes
2016
24 Aug
2 days 3 hours
38 earthquakes
24 Nov
4 days 12 hours
47 earthquakes
2017
4 Mar
2 days 10 hours
48 earthquakes
8 Jun
3 days 10 hours
47 earthquakes
2018
6 Mar
2 days 12 hours
95 earthquakes
10 Apr
2 days 11 hours
153 earthquakes
VS20180417.1(10.0km)
16 Apr
1 day 23 hours
40 earthquakes
22 Apr
7 days 19 hours
134 earthquakes
30 Apr
103 days 22 hours
42368 earthquakes
S20180502.1(26.5km)
1 May
8 days 9 hours
196 earthquakes
S20180505.2(22.5km)
4 May
3 days 4 hours
153 earthquakes
S20180505.1(22.6km)
4 May
18 days 23 hours
726 earthquakes
S20180703.3(29.7km)
2 Jul
2 days 1 hours
30 earthquakes
2019
30 Sep
2 days 8 hours
35 earthquakes
S20191114.1(26.5km)
13 Nov
27 days 22 hours
335 earthquakes
2020
S20200104.1(26.8km)
3 Jan
106 days 22 hours
1689 earthquakes
S20200302.1(19.4km)
1 Mar
4 days 18 hours
82 earthquakes
16 Mar
3 days 2 hours
34 earthquakes
S20200504.1(26.4km)
4 May
73 days 12 hours
948 earthquakes
S20200821.1(27.4km)
20 Aug
33 days 8 hours
392 earthquakes
3 Sep
1 day 6 hours
64 earthquakes
22 Oct
7 days 18 hours
177 earthquakes
18 Nov
1 day 8 hours
43 earthquakes
29 Nov
1 day 0 hours
88 earthquakes
1 Dec
23 days 2 hours
641 earthquakes
2021
S20210318.1(15.9km)
18 Mar
2 days 15 hours
113 earthquakes
VS20210624.1(11.1km)
23 Jun
3 days 0 hours
45 earthquakes
6 Jul
21 hours
30 earthquakes
4 Aug
8 days 18 hours
279 earthquakes
23 Aug
7 days 7 hours
859 earthquakes
3 Sep
3 days 11 hours
37 earthquakes
S20210927.3(10.2km)
27 Sep
4 days 6 hours
168 earthquakes
2022
6 Jan
1 day 23 hours
52 earthquakes
9 Jan
5 days 9 hours
182 earthquakes
15 Jan
1 day 4 hours
26 earthquakes
S20220620.1(17.3km)
19 Jun
244 days 22 hours
3458 earthquakes
20 Sep
1 day 1 hours
100 earthquakes
30 Dec
3 days 6 hours
44 earthquakes
2023
5 Jan
2 days 4 hours
67 earthquakes
13 Apr
2 days 14 hours
48 earthquakes
19 Apr
25 days 21 hours
422 earthquakes
20 May
6 days 18 hours
135 earthquakes
30 May
5 days 7 hours
108 earthquakes
6 Jun
1 day 9 hours
84 earthquakes
13 Aug
5 days 3 hours
331 earthquakes
21 Aug
21 days 21 hours
552 earthquakes
4 Oct
7 days 22 hours
244 earthquakes
17 Oct
2 days 10 hours
35 earthquakes
S20231021.1(27.8km)
20 Oct
11 days 13 hours
165 earthquakes
26 Oct
2 days 8 hours
62 earthquakes
12 Nov
11 days 4 hours
175 earthquakes
20 Nov
1 day 23 hours
71 earthquakes
24 Nov
2 days 7 hours
79 earthquakes
VS20231202.1(17.8km)
1 Dec
2 days 5 hours
49 earthquakes
6 Dec
10 days 10 hours
136 earthquakes
S20231208.1(15.9km)
7 Dec
2 days 13 hours
59 earthquakes
12 Dec
1 day 4 hours
38 earthquakes
VS20231229.1(18.9km)
28 Dec
4 days 20 hours
173 earthquakes
2024
VS20240127.1(29.0km)
27 Jan
30 days 9 hours
1836 earthquakes
S20240313.1(27.9km)
12 Mar
6 days 16 hours
103 earthquakes
5 Apr
2 days 22 hours
42 earthquakes
15 Apr
4 days 17 hours
130 earthquakes
24 Apr
17 days 10 hours
864 earthquakes
VS20240517.1(12.0km)
16 May
5 days 0 hours
198 earthquakes
S20240602.2(11.1km)
2 Jun
9 days 16 hours
450 earthquakes
21 Jun
28 days 3 hours
902 earthquakes
16 Aug
25 days 7 hours
751 earthquakes
11 Sep
13 days 12 hours
711 earthquakes
S20241201.2(16.1km)
30 Nov
10 days 4 hours
124 earthquakes
VS20241214.1(12.5km)
13 Dec
7 days 8 hours
90 earthquakes
S20241220.1(30.0km)
19 Dec
1 day 19 hours
42 earthquakes
23 Dec
19 hours
35 earthquakes
2026
VS20260115.1(19.8km)
14 Jan
7 days 3 hours
84 earthquakes
S20260120.2(10.2km)
19 Jan
1 day 15 hours
29 earthquakes
9 Apr
1 day 1 hours
25 earthquakes
28 Apr
9 days 19 hours
120 earthquakes
S20260701.1(27.6km)
30 Jun
2 days 1 hours
35 earthquakes
AI-generated article — for informational and entertainment purposes only. May contain inaccuracies. Full disclaimerFound an error?

Seismic Swarm VS20190903.1: Activity on the Island of Hawaii

A seismic swarm designated VS20190903.1 occurred on the Island of Hawaii from 23:04 on 2 September 2019 to 10:42 on 4 September 2019. Over 35 hours and 37 minutes, the sequence included 58 earthquakes. All events were recorded within the island's volcanic setting, with magnitudes ranging from 0.5 to 2.6 and depths mostly between 0 and 15 km.

The swarm began with two small events on 2 September at depths of 0 km. Activity intensified on 3 September, featuring repeated events near 10:34, 11:40, 20:02, and 22:30. Peak magnitudes reached 2.6, with several clusters showing nearly identical timing and locations. On 4 September, the sequence tapered off gradually, ending with a final magnitude 1.9 event at 10:42. Depths remained predominantly shallow, consistent with near-surface processes.

The Island of Hawaii comprises five shield volcanoes built over the Hawaiian hotspot. Kilauea and Mauna Loa dominate current activity, while Mauna Kea, Hualalai, and Kohala are less active. Magma movement through rift zones and shallow reservoirs frequently generates earthquake swarms. These sequences differ from tectonic mainshock-aftershock patterns by lacking a dominant large event and instead showing numerous events of similar size clustered in time and space.

Since 1 January 2000, 51 swarms have been identified on the island. Annual counts include three in 2000, eight in 2003, nine in 2018, and lower numbers in intervening years such as one each in 2001, 2005, 2008, and 2013. This history reflects persistent volcanic unrest driven by the hotspot's ongoing magma supply.

The 2019 swarm fits established patterns of low-magnitude, shallow seismicity linked to fluid or magma migration beneath the island's active volcanoes. Such episodes contribute to monitoring efforts that track potential changes in volcanic systems.

References USGS Hawaiian Volcano Observatory volcano monitoring reports USGS Earthquake Catalog for Hawaii region data Smithsonian Institution Global Volcanism Program Hawaii volcano summaries