2023-04-27 12:03:50
Two moderate earthquakes shake Big Island Hawaii
Date 4/27/23 | Time: 02:30:54 UTC | 19.19 N ; 155.38 W | Depth: 35 km | ML 4.5
Tonight there were 2 moderate earthquakes on Big Island Hawaii, which were clearly felt by the local residents. According to the EMSC, the stronger earthquake had a magnitude of 4.5 and manifested itself near the south-east coast not far from Pahala. The epicenter was localized 10 km east of the town. The hypocenter was at a depth of 35 km, which suggests that the quake is connected to magma rise, which has been happening in this region for a long time. As one study shows, Pahala appears to lie directly over the mantle plume, which supplies fresh melt to the volcanic system.
According to the EMSC, the second quake had a ML 4.2 and was also 35 kilometers deep. However, the EMSC located the epicenter under the western flank of Mauna Loa volcano. According to the HVO, the quake was weaker and had a magnitude of 3.9 at a depth of 26 kilometers. The scientists issued a statement that the quake was not directly related to the region’s volcanism, but was triggered by the island’s ballast and the resulting stress in the ocean plate.
There were other small tremors at shallow depths under Mauna Loa’s eastern flank, as well as other tremors manifested east of the Kilauea caldera. Nearly 120 tremors hit Kilauea yesterday. The ground uplift due to magma inflation remains comparatively high on both volcanoes, which is an indication that the fire mountains are already preparing for the next eruption. It’s hard to predict exactly when that will happen, but especially in the case of Kilauea, I suspect it won’t be too long.
Kilauea and Mauna Loa are active hotspot-type shield volcanoes that are among the most active volcanoes in the world. New studies show that the volcanoes are fed by a mantle plume that supplies melt to a branching conveyor system with multiple magma bodies.
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