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Earthquake Swarm Winds Down: Unofficial Statistics

10:42 PM · Aug 25, 2021

[Edit: Another earthquake occurred at 12:36pm with magnitude 2.2.] As of 12pm on August 25th, 2021, the shallow earthquake swarm beneath the southern Kīlauea caldera has significantly slowed and may have paused or ended. The last two summit events were recorded over 3 hours apart between 9:10am and 12:36pm, but further activity can't be ruled out. Here are some tallies for the 40-hour sequence. Unofficial Earthquake Swarm Statistics So Far: From USGS Reports [1]: Total events in swarm: over 415 (first 12 hrs - 140+, last 24 hrs - 275+) Depth range: 1-3 km (0.6-1.9 mi) Largest magnitude: 3.4, 1:36am on 8/24 Peak rate: 28 per hour, 7-8pm on 8/24 Average rate: ~10 per hour From IRIS Earthquake Browser (IMAGE) [2]: Distribution: Above magnitude 2: 58 (14%) Below magnitude 2: 364 (86%) Breakdown: Above magnitude 3: 1 (0.2%) Between magnitudes 2-3: 57 (13.5%) Between magnitudes 1-2: 225 (53.3%) Between magnitudes 0-1: 139 (32.9%) Total: 422 since 2pm on 8/23 (depth <20km) From USGS monitoring webpage [3]: Total across all of Kīlauea volcano: ~600+ since 8/23 Breakdown: 8/23 ~170 8/24 ~370 8/25 ~80 (to 12pm) If you missed it, read the USGS Hawaiian Volcano Observatory’s now-daily update with more details on the last 24 hours here: https://www.hawaiitracker.com/posts/6126b1a4494666000403fdbd --- Join our weekly live video review of Kīlauea and Maunaloa volcanoes, at 5pm Hawaiʻi time Thursdays! To support our productions please like, share and subscribe! Mahalo! #Kilauea2021 --- Source links: [1] https://www.usgs.gov/volcanoes/kilauea/volcano-updates [2] http://ds.iris.edu/ieb/index.html [3] https://www.usgs.gov/media/images/earthquake-rates-and-depths-past-month-k-lauea

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