Maui News

No Tsunami Threat After 4.6 Big Island Quake

March 20, 2016, 7:40 AM HST
* Updated March 20, 9:34 AM
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Big Island earthquake, 3.20.16. Map courtesy USGS.

Big Island earthquake, 3.20.16. Map courtesy USGS.

The U.S. Geological Survey’s Hawaiian Volcano Observatory recorded a magnitude-4.6 earthquake located beneath the Island of Hawaiʻi on

Sunday, March 20, at 6:43 a.m., HST. The Pacific Tsunami Warning Center has determined that no damaging tsunami was generated.

According to HVO, this earthquake was centered about 14.0 km (8.7 mi) east of Waikoloa and 19.8 km (12.3 mi) southwest of Waimea, at a depth of 31.8 km (19.8 mi).

The earthquake was widely felt on the Island of Hawaiʻi. The USGS Did You Feel It Website received more than 480 felt reports within an hour of the earthquake. Most of the felt reports were from the Islands of Hawaiʻi and Maui, with a few reports from Oʻahu, over 250 km (155 mi) from the epicenter. Moderate shaking (Intensity V) has been reported. At these shaking intensities, damage to buildings or structures is not expected.

As of 8 a.m., HST, no aftershocks of the magnitude-4.6 earthquake have been recorded.

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Over the past 25 years, there have been 4 earthquakes with magnitudes greater than 4.0 and at depths greater than 20 km (12 mi) beneath the northern half of Hawaiʻi Island, including today’s event. Deep earthquakes in this region are most likely caused by structural adjustments within the Earth’s crust due to the weight of the overlying volcanoes.

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Adjustments beneath the northern half of Hawai’i Island during past similar events, such as in March 2010, have produced a flurry of earthquakes, with many small aftershocks occurring for days after the main quake. Given this history, it is possible that additional small earthquakes may be recorded in the coming days.

According to HVO Scientist-in-Charge Christina Neal the earthquake had no apparent effect on Kīlauea Volcano’s ongoing eruptions. “HVO monitoring networks have not detected any significant changes in activity at the summit or along the rift zones of Kīlauea resulting from the earthquake.”

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Did you feel it? The USGS reports a 4.6M quake occurred 8 miles SE of Waikoloa on the Big Island at 6:43 a.m. Sunday March 20, 2016. We’ve received numerous reports from our users at BigIslandNow.com of two strong jolts occurring. There is no tsunami threat.
~ Meteorologist Malika Dudley

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