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Mauna Loa volcano (Big Island, Hawai'i): seismic swarm

dim., 25 sept. 2022, 17:01
17:01 PM | AUTEUR : MARTIN
The seismic activity beneath Mauna Loa volcano during 16-23 Sep (image: Hawaii Tracker)
The seismic activity beneath Mauna Loa volcano during 16-23 Sep (image: Hawaii Tracker)
The Hawaiian Volcano Observatory (HVO) reported that a small seismic swarm is occurring beneath the summit of the volcano.
At about 02:00 local time starting on 23 September, the seismic network recorded over 38 earthquakes beneath the summit caldera region with most earthquakes in a cluster about 3.1 mi (5 km) wide and -1.2 to 0.6 mi (-2 to 1 km) below the surface. These earthquakes may result from changes in the magma storage system and/or may be part of normal re-adjustments of the volcano due to changing stresses within it.
According to HVO Scientist-in-Charge Ken Hon, "Seismic activity beneath Mauna Loa has been gradually increasing over the past two months. Small earthquake swarms are considered a normal part of this increase in activity. Currently, there are no indications that magma is moving toward the surface and other monitoring systems are displaying normal behavior. Levels of seismicity and deformation remain below those recorded during the winter of 2021."
Source: Hawaiian Volcano Observatory volcano activity update 25 September 2022

Actualités précédentes

jeu., 5 mai 2022, 12:05

Mauna Loa volcano (Hawaii, United States): slightly elevated seismicity

Mauna Loa earthquakes over the past week. Photo Credit: USGS.
During the past week, HVO seismometers recorded approximately 62 small-magnitude (below M3.0) earthquakes below the summit and upper-elevation flanks of Mauna Loa. The majority of these earthquakes occurred at shallow depths less than 15 kilometers (9 miles) below sea level. ... Read all
ven., 16 avril 2021, 18:20

Maunaloa volcano (Hawaiʻi): Swelling slowly continues, no significant change

This InSAR interferogram shows the overall inflation of Mauna Loa’s summit that occurred from November 2020 to March 2021. It also shows several fringes (color cycles) consistent with subsidence inside Moku‘āweoweo caldera and related to a shallow earthquake that was recorded on March 6, 2021. The red circles show the locations of earthquakes associated with that event as determined by HVO’s seismic network. (Image: USGS-HVO)
Unlike her neighbor Kīlauea to the south, Maunaloa is not erupting, and yet has been arguably more visible in the mainstream news this past month. ... Read all
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Maunaloa volcan
Shield volcano 4170 m / 13,681 ft
Big Island, Hawai'i, 19.48°N / -155.61°W
Condition actuelle: en éruption (4 sur 5) Eruptions du volcan Maunaloa:
1832, 1843, 1849, 1851, 1852, 1855-56, 1859, 1865-66, 1868, 1870(?), 1871, 1872, 1873, 1873-74, 1875, 1876, 1877, 1879, 1880, 1880-81, 1887, 1892, 1896, 1899, 1903, 1907, 1914-15, 1916, 1919, 1926, 1933, 1935-36, 1940, 1950, 1975, 1984, 2022 (Nov-ongoing)
Style éruptif tipique
Effusives position dominante.

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