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NEW: A magnitude 6.0 earthquake struck the Big Island of Hawaii overnight into May 23. It occurred at 7:46:01 UTC, or 9:46 p.m. Friday evening local time.
It was the result of oblique reverse faulting; this happened at a shallow depth of 14 miles.
The United States Geological Survey writes that "large earthquakes in Hawaii that occur at this depth are typically caused by lithospheric flexure due to the weight of the Hawaiian Islands pressing down on the underlying oceanic plate."
Moreover, the depth of this quake suggests it is NOT tied to magmatic processes, meaning this does not herald any sort of related upcoming volcanic eruption.
From the United States Geological Survey:
"The Island of Hawaii is the youngest island in a chain of volcanoes that stretches about 5,500 km across the northern Pacific Ocean. The island chain results from magma generated by a source deep within the mantle, the Hawaiian hotspot. The ocean crust and lithosphere above the hotspot, within the Pacific tectonic plate, move to the northwest with respect to the deep magma source. Over millions of years, new island volcanoes form, and older volcanoes are carried away from the hotspot (towards the northwest), erode, and eventually subside beneath sea level."
These types of non-volcanic earthquakes help release stress that's been pent-up long term. In the past 50 years, there have been 36 other quakes with magnitudes greater than 5.0 within 60 miles of today's event.
On November 29, 1975, the Magnitude 7.7. Kalapana quake killed two and resulted in numerous landslides, reshaping parts of the Big Island's south coast.