Following the 6.4 magnitude earthquake that struck Southern California, Los Angeles will lower the notification threshold on its ShakeAlertLA app.
Thursday’s quake damaged homes and rattled nerves in Ridgecrest and other Mojave Desert communities, and. The shaking that hit Los Angeles, 125 miles away, did not reach level 4 on the Modified Mercalli Intensity Scale, and therefore no push notification was sent to ShakeAlert users, said Robert de Groot from the Earthquake Science Center at USGS.
Even if the magnitude threshold had been lowered for Thursday’s earthquake, a ShakeAlert notification still would not have been activated, Holm said. The threshold for the Modified Mercalli Intensity Scale on ShakeAlert will not change. When an earthquake meets the criteria for a notification, users get a push that starts with “earthquake, earthquake, expect shaking.”
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