For decades, a mysterious swarm of earthquakes has rumbled beneath the small town of Pahala near the southern coast of the island of Hawaii. Now, scientists have discovered the source of this geologic ruckus
The team applied these methods to 3.5 years’ worth of Hawaiian seismic data, recorded between 2019 and 2022. The system identified nearly 200,000 earthquakes of the swarm, illuminating the stacked sill structures in the upper mantle. The extreme detail even allowed the scientists to track magma as it trickled into a sill, kicking off a cascade of quakes.
He describes the complex of sills as the"gateway into the system," providing a means to transport magma horizontally away from the area beneath Pahala. These underground features don't contain empty space, instead representing a weak zone in the rock where magma has intruded and spread as a molten sheet. The complex links up with athat leads to Kilauea as well as an area that the team believes is connected to Mauna Loa.
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