USGS HVO Press Release—Magnitude-4.3 earthquake under Kīlauea Volcano's south flank

Release Date:

The U.S. Geological Survey's Hawaiian Volcano Observatory (HVO) recorded a magnitude-4.3 earthquake located beneath Kīlauea Volcano's south flank on Friday, July 3, at 2:19 p.m., HST.

The earthquake was centered about 5.6 km (3.5 miles) south of Pu‘u ‘Ō‘ō, about 1.7 km (1 mile) north of last night's M4.6 earthquake, at approximately 7.1 km depth (4.4 miles). A map showing its location is posted on the HVO website at http://volcanoes.usgs.gov/hvo/earthquakes/. More details are available at the National Earthquake Information Center website at https://earthquake.usgs.gov/earthquakes/eventpage/hv72028657/.

Weak shaking, with maximum Intensity of III on the Modified Mercalli Intensity Scale, has been reported across the Island of Hawai‘i. At that intensity, significant damage to buildings or structures is not expected. The USGS "Did you feel it?" service (http://earthquake.usgs.gov/dyfi/) received over 220 felt reports within the first hour of the earthquake.

According to HVO seismologist Ashton Flinders, the earthquake had no apparent effect on Kīlauea or Mauna Loa volcanoes. "We do not see any immediate changes in activity at Kīlauea or Mauna Loa as a result of either this earthquake or the M4.6 earthquake last night. It is not uncommon for aftershocks like these to happen in relatively short succession. Further aftershocks remain possible and may be felt." HVO continues to monitor Kīlauea and other Hawaiian volcanoes for any changes.

Aftershocks are the result of crustal settling from larger earthquakes, such as the M6.9 that occurred on May 4, 2018. The location, depth, and waveforms recorded as part of today's earthquake are consistent with slip along this south flank fault. While most earthquakes under Kīlauea's south flank are caused by abrupt motion of the volcano to the southeast over the oceanic crust, some patches of the fault that did not slip during the larger earthquakes are primed to slip as subsequent aftershocks.

According to the Pacific Tsunami Warning Center, there is no tsunami threat from this earthquake.

For information on recent earthquakes in Hawaii and eruption updates, visit the USGS Hawaiian Volcano Observatory website at http://volcanoes.usgs.gov/hvo/earthquakes/.

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Daily updates about Kīlauea's ongoing eruptions, recent images and videos of summit and East Rift Zone volcanic activity, maps, and data about recent earthquakes in Hawaii are posted on the HVO website at hvo.wr.usgs.gov.

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