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Strong mag. 5.5 earthquake - 7.3 mi east of Milpitas, Santa Clara County, California, USA, on Wednesday, October 31, 2007 at 03:04 GMT

Strong magnitude 5.5 earthquake at 10 km depth

Earthquake details

Date & time	Oct 31, 2007 03:04:54 UTC
Local time at epicenter
Status	Confirmed
Magnitude	5.5
Depth	9.7 km
Epicenter latitude / longitude	37.4335°N / 121.77433°W (Santa Clara, California, United States)
Antipode	37.434°S / 58.226°E
Shaking intensity	Strong shaking near epicenter
Felt	0 reports
Primary data source	USGS (United States Geological Survey)
Nearest volcano	Clear Lake (192 km / 119 mi)
Nearby towns and cities	7 km (4 mi) NNE of East Foothills (pop: 8,270) \| Show on map \| Quakes nearby 12 km (7 mi) E of Milpitas (pop: 77,600) \| Show on map \| Quakes nearby 15 km (9 mi) NE of San Jose (pop: 1,026,900) \| Show on map \| Quakes nearby 18 km (11 mi) ENE of Santa Clara (pop: 126,200) \| Show on map \| Quakes nearby 23 km (14 mi) ESE of Fremont (pop: 232,200) \| Show on map \| Quakes nearby 24 km (15 mi) ENE of seonibeil (pop: 151,800) \| Show on map \| Quakes nearby 27 km (17 mi) SSE of Pleasanton (pop: 79,500) \| Show on map \| Quakes nearby 28 km (17 mi) S of Livermore (pop: 88,100) \| Show on map \| Quakes nearby 68 km (42 mi) ESE of San Francisco (pop: 864,800) \| Show on map \| Quakes nearby 130 km (81 mi) S of Sacramento (pop: 490,700) \| Show on map \| Quakes nearby
Weather at epicenter at time of quake
Estimated seismic energy released	1.1 x 10¹³ joules (3.12 gigawatt hours, equivalent to 2682 tons of TNT or 0.2 atomic bombs!) \| about seismic energy

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Data for the same earthquake reported by different agencies

Info: The more agencies report about the same quake and post similar data, the more confidence you can have in the data. It takes normally up to a few hours until earthquake parameters are calculated with near-optimum precision.

Mag.	Depth	Location	Source
5.5	9.7 km	San Francisco Bay area, California (USA)	USGS

Note: for quakes of 2012 and earlier, our database often contains only records from USGS.

Most recent quakes Top 20 past 24 hrs Quakes in the US California

Seismograms

Seismic station: Columbia College, Columbia, CA, USA (CMB/BK network) | Distance from quake: 139 km / 86 mi | Show on map | Station Info

Seismic station Columbia College, Columbia, CA, USA: vertical movement plot around time of quake (source: IRIS/BUD)

Seismogram (vertical component) around time of quake. Thin dotted red line indicates time of quake. Seismic waves arrive some time later, depending on distance. Source: IRIS Buffer of Uniform Data (BUD) webtool

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Seismic station Columbia College, Columbia, CA, USA: horizontal (E-W) movement plot around time of quake (source: IRIS/BUD)

Seismic station Columbia College, Columbia, CA, USA: horizontal (N-S) movement plot around time of quake (source: IRIS/BUD)

Seismograms around time of quake, showing horizontal E-W and N-S ground movements. Source: IRIS Buffer of Uniform Data (BUD) webtool

Seismic station: NVAR Array Site 31, Mina, NV, USA (NV31/IM network) | Distance from quake: 336 km / 209 mi | Show on map | Station Info

Seismic station NVAR Array Site 31, Mina, NV, USA: vertical movement plot around time of quake (source: IRIS/BUD)

Seismic station NVAR Array Site 31, Mina, NV, USA: horizontal (E-W) movement plot around time of quake (source: IRIS/BUD)

Seismic station NVAR Array Site 31, Mina, NV, USA: horizontal (N-S) movement plot around time of quake (source: IRIS/BUD)

Seismograms around time of quake.
Top: vertical movement, bottom: horizontal (E-W and N-S) movements. Source: IRIS Buffer of Uniform Data (BUD) webtool

Seismic station: Art Center College of Design (GSN-affiliate) (PASC/CI network) | Distance from quake: 486 km / 302 mi | Show on map | Station Info

Seismic station Art Center College of Design (GSN-affiliate): vertical movement plot around time of quake (source: IRIS/BUD)

Seismic station Art Center College of Design (GSN-affiliate): horizontal (E-W) movement plot around time of quake (source: IRIS/BUD)

Seismic station Art Center College of Design (GSN-affiliate): horizontal (N-S) movement plot around time of quake (source: IRIS/BUD)

Seismograms around time of quake.
Top: vertical movement, bottom: horizontal (E-W and N-S) movements. Source: IRIS Buffer of Uniform Data (BUD) webtool

Seismic station: Corvallis, Oregon, USA (COR/IU network) | Distance from quake: 806 km / 501 mi | Show on map | Station Info

Seismic station Corvallis, Oregon, USA: vertical movement plot around time of quake (source: IRIS/BUD)

Seismic station Corvallis, Oregon, USA: horizontal (E-W) movement plot around time of quake (source: IRIS/BUD)

Seismic station Corvallis, Oregon, USA: horizontal (N-S) movement plot around time of quake (source: IRIS/BUD)

Seismograms around time of quake.
Top: vertical movement, bottom: horizontal (E-W and N-S) movements. Source: IRIS Buffer of Uniform Data (BUD) webtool

Seismic station: Albuquerque, New Mexico, USA (ANMO/IU network) | Distance from quake: 1400 km / 870 mi | Show on map | Station Info

Seismic station Albuquerque, New Mexico, USA: vertical movement plot around time of quake (source: IRIS/BUD)

Seismic station Albuquerque, New Mexico, USA: horizontal (E-W) movement plot around time of quake (source: IRIS/BUD)

Seismic station Albuquerque, New Mexico, USA: horizontal (N-S) movement plot around time of quake (source: IRIS/BUD)

Seismograms around time of quake.
Top: vertical movement, bottom: horizontal (E-W and N-S) movements. Source: IRIS Buffer of Uniform Data (BUD) webtool

User reports for this quake

User reports estimate the perceived ground shaking intensity according to the MMI (Modified Mercalli Intensity) scale.

There are no user reports for this quake.

Aftershocks

[More info]

Recorded aftershocks, latest first (35 quakes)

Date and time	Mag Depth	Location	Details
Dec 23, 2007 05:13 15 years ago	2.0 7.2 km	San Francisco Bay Area, California (USA)	More
Dec 21, 2007 12:14 15 years ago	3.1 8 km	12 mi E of San Jose, Santa Clara County, California, USA	More
Dec 18, 2007 16:49 15 years ago	2.2 9.6 km	San Francisco Bay Area, California (USA)	More
Dec 17, 2007 21:14 15 years ago	2.1 4.9 km	Northern California (USA)	More
Dec 14, 2007 21:46 15 years ago	2.4 4.7 km	San Francisco Bay Area, California (USA)	More
Dec 11, 2007 16:01 15 years ago	2.2 7.3 km	San Francisco Bay Area, California (USA)	More
Dec 9, 2007 14:48 15 years ago	2.0 6.2 km	Northern California (USA)	More
Dec 5, 2007 03:09 15 years ago	2.4 8.1 km	San Francisco Bay Area, California (USA)	More
Dec 4, 2007 12:48 15 years ago	2.1 9.1 km	San Francisco Bay Area, California (USA)	More
Nov 30, 2007 02:40 15 years ago	2.2 4.6 km	Northern California (USA)	More
Nov 27, 2007 17:12 15 years ago	2.3 10.9 km	San Francisco Bay Area, California (USA)	More
Nov 27, 2007 17:06 15 years ago	2.6 7.6 km	San Francisco Bay Area, California (USA)	More
Nov 25, 2007 14:59 15 years ago	2.3 7.5 km	Northern California (USA)	More
Nov 24, 2007 05:18 15 years ago	2.7 5.2 km	7.4 mi E of Milpitas, Santa Clara County, California, USA	More
Nov 21, 2007 08:41 15 years ago	2.0 4.7 km	Northern California (USA)	More
Nov 19, 2007 05:59 15 years ago	2.1 7.9 km	Northern California (USA)	More
Nov 16, 2007 13:40 15 years ago	2.0 6.4 km	San Francisco Bay Area, California (USA)	More
Nov 15, 2007 23:33 15 years ago	2.4 8.7 km	San Francisco Bay Area, California (USA)	More
Nov 14, 2007 21:47 15 years ago	2.4 9.4 km	San Francisco Bay Area, California (USA)	More
Nov 12, 2007 15:50 15 years ago	2.6 6.9 km	San Francisco Bay Area, California (USA)	More
Nov 11, 2007 17:53 15 years ago	2.2 7.1 km	San Francisco Bay Area, California (USA)	More
Nov 11, 2007 17:14 15 years ago	2.1 5.8 km	San Francisco Bay Area, California (USA)	More
Nov 6, 2007 20:47 15 years ago	2.6 7.5 km	Northern California (USA)	More
Nov 4, 2007 21:43 15 years ago	2.2 8.3 km	San Francisco Bay Area, California (USA)	More
Nov 4, 2007 12:49 15 years ago	2.8 7.4 km	9.1 mi NE of San Jose, Santa Clara County, California, USA	More
Nov 3, 2007 14:38 15 years ago	2.0 7.7 km	San Francisco Bay Area, California (USA)	More
Nov 2, 2007 04:01 15 years ago	2.0 6.5 km	San Francisco Bay Area, California (USA)	More
Nov 1, 2007 13:48 15 years ago	2.0 8.1 km	San Francisco Bay Area, California (USA)	More
Oct 31, 2007 22:54 15 years ago	3.7 8.5 km	7 mi E of Milpitas, Santa Clara County, California, USA	More
Oct 31, 2007 19:41 15 years ago	2.2 8.2 km	San Francisco Bay Area, California (USA)	More
Oct 31, 2007 14:14 15 years ago	2.3 7.2 km	San Francisco Bay Area, California (USA)	More
Oct 31, 2007 09:57 15 years ago	2.8 8.4 km	9.5 mi E of San Jose, Santa Clara County, California, USA	More
Oct 31, 2007 08:05 15 years ago	2.1 5.3 km	San Francisco Bay Area, California (USA)	More
Oct 31, 2007 06:02 15 years ago	2.0 9.9 km	San Francisco Bay Area, California (USA)	More
Oct 31, 2007 03:41 15 years ago	2.0 8.1 km	San Francisco Bay Area, California (USA)	More

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