Mauna Loa volcano (Big Island, Hawaii): seismic swarm

Fri, 19 Mar 2021, 08:33
08:33 AM | BY: MARTIN
Upper part of Mauna Loa SW rift zone (image: HVO)
Upper part of Mauna Loa SW rift zone (image: HVO)
The Hawaiian Volcano Observatory (HVO) reported that a swarm of small earthquakes occurred at 15:46 local time yesterday beneath the southeastern flank of Mauna Loa volcano and northwestern summit of Kilauea volcano at zone known as upper Ka'ōiki.
The seismic network detected over 40 earthquakes at 0.5-6 km depth located 21 km W-NW of the volcano. The largest recorded event reached magnitude M 3.5. Reported felt events were described as weak shaking, with a maximum Intensity of II on the Modified Mercalli Intensity Scale.
These earthquakes do not show any signs of magmatic involvement and are part of normal re-adjustments of the volcano due to changing stresses within it.
Other monitoring data streams for Kīlauea and Mauna Loa, including ground deformation, gas, and imagery, show no signs of increased activity.
Source: Hawaiian Volcano Observatory volcano activity update 19 March 2021

Previous news

Thu, 11 Mar 2021, 07:34
Red arrow shows the location of the earthquake M 4.2 yesterday; red frame in the upper right corner of image shows magnitude, depth and date/time of the earthquake (image: HVO)
Seismic network of the Hawaiian Volcano Observatory (HVO) detected a volcano-tectonic earthquake with magnitude M 4.2 at approx. 26 km (16 miles) km depth beneath the southeast flank at 14:21 local time yesterday. The earthquake was located 17 km (11 mile) north-northeast of Pāhala in the vicinity of the Kaʻōiki Pali. ... Read all
Fri, 18 Sep 2020, 07:33
Middle part of the volcano´s Southwest Rift Zone (image: HVO)
During the past week the Hawaiian Volcano Observatory (HVO) recorded 67 small-magnitude earthquakes on the volcano's summit and upper-elevation flanks. Most of these earthquakes occurred at shallow depths of less than 8 km (~5 miles) below ground level. ... Read all
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