Map of earthquakes and aftershocks from 11-16 May 2023 near Lake Almanor, CA

By California Volcano Observatory May 16, 2023

A shaded relief map of Lassen Volcanic National Park and Lake Almanor to the southeast also shows SR 36 running from west to east across the map. Just south of SR36 at the center of the map, the two lobes of Lake Almanor are overlain by two large red dots where the mainshocks occurred, as well as dozens of smaller pink dots where aftershocks happened. The area is crossed from top to bottom with lines representing Quaternary faults.

Detailed Description

This map shows the locations of two M5+ earthquakes and numerous aftershocks in and around Lake Almanor, CA, from 11-16 May 2023. The earthquakes are associated with normal Basin and Range province faulting, and there are numerous fault zones under and around the lake which could be the source of the sequence. USGS graphic by Jessica L. Ball.

Sources/Usage

Public Domain.