This page uses the Three.js 3D JavaScript library to show real-time double-difference hypocenter locations of earthquakes in Northern California. The box below is centered on event 73875915, which has the following hypoDD-RT solution:
Date: 2023/04/20 | Time: 17:55:16.790 | Latitude: 38.78036 | Longitude: -122.70984 | Depth: 3.108 | Magnitude: 1.20
Quality: 1 | Shift: 1.530 | Version: 2.1The high-resolution background seismicity included in the box comes from two double-difference catalogs. Hypocenters for the years 1984-2011 are taken from the DD base catalog for Northern California (NCAeqDD.v201112.1). Hypocenters from 2012 up to present are taken from the real-time double-difference catalog DD-RT (NCAeqDDRT.v201201). Earthquakes from the DD catalog are represented by gray dots, those from the DD-RT catalog by colored dots.
There are 19116 earthquakes in the box. Magnitude cutoff is 1.5 (except for events within the last week).
Legend: Viewer instructions:
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3D applet written by Robert Simpson (USGS), Felix Waldhauser and Eric Malikowski (LDEO).
Time created: Mon Apr 24 16:32:01 UTC 2023