M4.9 earthquake 7km SW of Grapevine, CA

A magnitude 4.9 earthquake struck 7km SW of Grapevine, CA on Fri, Aug 1, 1952, 6:04 AM GMT-7 (13:04 UTC), 6 km (4 mi) below the surface.

A larger quake followed: M5.5 The 1952 Bakersfield, California Earthquake. This one was a foreshock.

Map

Where this earthquake was located, with the others nearby. Select one for its page.

Different scales measure different things and differ by a few tenths. The USGS marks one as preferred, and it is the one this page uses.

Mag.	Scale	Computed by	Notes
4.92	ML, local (Richter)	Southern California Seismic Network	Preferred · Final · ±0.141 · 6 stations
5.1	ML, local (Richter)	USGS historic United States catalog	Final

The USGS’s account of the effects of this earthquake.

Maximum observed Modified Mercalli Intensity (MMI) V

From the USGS event page for ci3317879. U.S. Geological Survey text and figures are in the public domain.

The USGS ShakeMap: shaking estimated from seismic stations and the quake’s size, on the Modified Mercalli intensity scale.

No one has reported feeling this quake to the USGS.

Reviewed by a seismologist.

Distance and direction from each place to the epicenter, with its forecast.

Within 100 km, magnitude 1.9 and up: 72 in the 60 days after this one and at least 200 in the 30 days before it.

The first 60 of 72.

From the USGS Earthquake Hazards Program and its partner networks, event ci3317879 (also filed as ushis1848). Read Thu, Oct 1, 2026, 10:52 AM UTC.