The USGS first reported the quake at 9:48 a.m., saying its epicenter was located about 18 miles south-southwest of the Avalon island community and 44 miles south of San Pedro. However, there was no earthquake. About an hour after the initial report, the USGS ShakeAlert system said it had in fact “detected a non-earthquake event” that triggered the system. Hello everyone – #ShakeAlert has detected a non-earthquake incident that triggered our system. Fortunately, no public notifications were sent. It’s somewhat of a first time for us why these events happen so rarely. Sorry for any confusion from our previous tweets. – USGS ShakeAlert (@USGS_ShakeAlert) April 15, 2022 It was not immediately clear which event could have caused the system to record a 4.0 magnitude earthquake. DEVELOPMENT: More details will be added to this report as soon as they become available. The City News Service contributed to this report. Copyright © 2022 KABC Television, LLC. All rights reserved.
