Link to USGS home page.
Earthquake Hazards Program

Magnitude 3.9 NORTHERN CALIFORNIA

Friday, July 20, 2007 at 17:50:20 UTC

Preliminary Earthquake Report

Versión en Español

Magnitude 3.9
Date-Time
  • Friday, July 20, 2007 at 17:50:20 (UTC) - Coordinated Universal Time
  • Friday, July 20, 2007 at 10:50:20 AM local time at epicenter

  • Time of Earthquake in other Time Zones
    Location 38.80N 122.80W
    Depth 1 kilometers
    Region NORTHERN CALIFORNIA
    Distances 25 km (15 miles) SW of Clearlake, California
    40 km (25 miles) N of Santa Rosa, California
    50 km (30 miles) SE of Ukiah, California
    115 km (75 miles) WNW of SACRAMENTO, California
    Location Uncertainty Error estimate not available, held by USGS NEIC to another agency's solution
    Parameters not available
    Source Northern California Seismic Network, UC Berkeley & USGS Menlo Park, USA
    Remarks Felt at Cloverdale, Eureka, Healdsburg, Kelseyville, Middletown, Saint Helena and The Sea Ranch.
    Event ID usfabh

    Location Maps

    Did You Feel It?
    Report shaking and damage at your location. You can also view a map displaying accumulated data from your report and others.

    Historic Seismicity

    Theoretical P-Wave Travel Times

     Historic Moment Tensor Solutions

    Phase (Arrival Time) Data

    Seismic Hazard Map

    Earthquake Density Maps

    National Seismic Hazard Mapping Project USGS National Seismic Hazard Mapping Project

    Current information about the rate at which earthquakes occur in different areas, and on how far strong shaking extends from the earthquake source.

    Earthquake Information for California

    San Francisco Regional Earthquake Map

    Earthquakes: Frequently Asked Questions

    NB: The official magnitude for this earthquake is indicated at the top of this page. This was the best available estimate of the earthquake's size, at the time that this page was created. Other magnitudes associated with web pages linked from here are those determined at various times following the earthquake with different types of seismic data. Although, given the data used, they are legitimate estimates of magnitude they are not considered the official magnitude.

    The region name is an automatically generated name from the Flinn-Engdahl (F-E) seismic and geographical regionalization scheme. The boundaries of these regions are defined at one-degree intervals and therefore differ from irregular political boundaries. More->

    Preliminary Earthquake Report
    U.S. Geological Survey, National Earthquake Information Center
    World Data Center for Seismology, Denver

     


    FirstGov button  Take Pride in America button