M 5.8 - 18km SSE of Lone Pine, CA

  • 2020-06-24 17:40:49 (UTC)
  • 36.447°N 117.975°W
  • 4.7 km depth

ShakeAlert ®

 Contributed by EW last updated 2020-06-24 17:45:08 (UTC)
  • The data below are the most preferred data available
  • The data below have been reviewed by a scientist

Post ShakeAlert ® Message Summary

This report provides an overview of the performance of the ShakeAlert system during this event.

Reviewed: ShakeAlert® message issued at 2020-06-24 17:40:49.1 UTC.

Earthquake

Title
M 6.0 - 59.8 mi N of Ridgecrest
Time
2020-06-24 17:40:49.130 (UTC)
ShakeAlert Event ID
ew1593020449

Summary Report

ShakeAlert Messages Issued (after origin time):
Initial: 10.0 s
Final: 54.6 s
ShakeAlert System Magnitude Estimates:
Initial: M 5.0
Final: M 6.2
ANSS report: 127 s after origin, M6.0
ShakeAlert System Location Accuracy:
Initial: 1 km (0 mi) SSE
Final: 18 km (11 mi) WSW
Wireless Emergency Alert:
WEA alerts are distributed to the MMI 4+ area if ShakeAlert Peak M >= 5.0
Number of Stations Reporting:
1 within 10km of epicenter
25 within 100km of epicenter
166 used in final ShakeAlert update
Nearby Cities
CityDistanceTime*Shaking (MMI**)
Ridgecrest 96 km (60 mi) — Weak (II)
Visalia 119 km (74 mi) — Weak (II)
Pahrump 178 km (110 mi) — Not felt (I)
Los Angeles 268 km (167 mi) — Not felt (I)

Radius shaken before Message release: 35 km (22 mi)

  • Marker
    200 km
    100 mi
    Figure 1. ShakeAlert initial earthquake location (black dot). Star is regional network epicenter. MMI 4 polygon is the estimated initial alert area. Red circle is front of peak shaking when the alert was released. Shaking takes 10 s to expand from circle to circle.
  • Marker
    200 km
    100 mi
    Figure 2. Polygons show shaking intensity contours for the peak magnitude ShakeAlert. Shaking of intensity 3 or less is often not felt. Star shows the regional network epicenter.

Footnotes

  1. * Time — Time from message release to predicted S-wave arrival at the location. "—" for weak or imperceptable shaking.
  2. ** MMI — Modified Mercalli Intensity: a numeric shaking severity scale
  3. *** For earthquakes deeper than ~15 km, the ShakeAlert Message may be available before peak shaking reaches the surface.