Seismo-Watch Earthquake Reports
Seismo-Watch Earthquake Reports provide weekly news and information of specific areas of interest. They are the premier weekly earthquake reports and essential for those interested in tracking earthquakes, as well as those who are casually interested in what has been happening.

Each report comes with an e-mail update notifications to keep you informed of when the report has been updated.

You can also subscribe to earthquake alert bulletins to keep you keenly aware of signification action when it happens.


Seismo-Watch currently features three online earthquake reports:

  • Central California (CCA) Report
      In 1989, a powerful M 7.0 earthquake occurred in the Southern Santa Cruz Mountains near Loma Prieta Peak and caused billions of dollars of damage throughout Central California. To the south is the creeping segment of the San Andreas Fault that constantly produces a couple dozen earthquakes per week. At the southern margin of the reporting area is Parkfield, an area that has produced six ~M 6.0 earthquakes in the last 150 years and was thought to be a likely location for a seventh in the 1980s, but it never occurred, perhaps because of a M 6.6 earthquake at nearby Coalinga. Always active, every changing, compelling from week to week. Includes an archive back to 1993.
  • Southern California (SCA) Report << the premier earthquake report
    A popular comprehensive regional report that has continued the Seismo-Watch tradition of nearly a decade. Once only available by subscription, now featured online for free. Coverage spans from the Colorado Delta region of Baja, Mexico, to Central California and the southern Sierra. It is so active that a M 2.0 cutoff is used to better characterize this most seismically active region of the continental United States. Large M 6.0+ earthquakes strike the region on an average of every six years, but the last decade has seen four, including a pair in the M 7.0 range. Don't miss the action!


Recently discontinued online earthquake reports

  • Mammoth Lakes (MAM) Report << discontinued 04/14/04
      Located along the eastern margin of the Central Sierra, this beautiful area has long been known for its rugged country, deep snow, and earthquakes and volcanic activity. This area came alive in 1978 and made world headlines in 1980 following four ~M 6.0 earthquakes a week following the Mount St. Helens eruption. Periodoic earthquake swarms can occur suddenly and have at times posted more the 2,000 quakes-per-day. Long gaps between significant activity adds tension and anticipation and make this a facinating area to watch.
  • Northern California Coast (NCC) Report << discontinued 10/25/03
      Cape Mendocino and its off shore seismic zones are some of the most seismically active regions of not only California, but all of the continental United States. Notable Earthquakes: During July and August 1991, four strong earthquakes struck the northern California and Oregon coasts. The sequence began at 7:50 p.m., July 12 with a strong M6.9 earthquake occurred about 50 miles WNW of Crescent City in the Pacific Ocean. The next three earthquakes occurred on August 16-17 within a space of just 24 hours. The first measured M6.3 and struck at 3:26 p.m. on August 16 time about 62 miles WSW of Crescent City slightly south of the initial jolt. It was followed 21 hours later by a M6.2 temblor at 12:29 p.m., August 17, at Cape Mendocino, near Honeydew. The strongest temblor registered M7.1 and struck a little less than 3 hours later in nearly the same location as the second jolt. The Honeydew quake, the only one centered on land, caused substantial damage in the Matole River Valley where homes were jarred from foundations, chimneys were downed, and cracked walls and broken windows occurred in many buildings. Landslides, rock falls, and liquefaction features were widespread, as were changes in water flows from local springs. While the rapid sequence of events was unprecedented for the region, eight months later another series of three M6+ earthquakes shook the region and included one damaging event as large as M7.1.
    • North (San Francisco) Bay Area (NBA) Report << discontinued 10/25/03
        Began in in 2002, this report highlights activity along the California Coast Range from San Francisco Bay to Willits. It includes tectonic action along the San Andreas, Calaveras, Hayward, Maacama and Rodgers Creek faults, that have a combined 70% probability of producing a M 7.0+ earthquake within the next 30 years. Also includes The Geyers, a geothermal area mined for its steam to produce electricity that perpetually produces dozens of seismic events each week!
    • Coachella Valley (COA) Report << discontinued 10/18/02
      This report provides view of a "locked" segment of the San Andreas Fault in popular resort-destination area of eastern Southern California. It is where the San Andreas Fault bends westward to pass through the San Jacinto and San Bernardino Mountains, thus creating the opportunity for abundant activity. While large earthquakes have occurred nearby in recent years, the faults in Coachella Valley have been unusually quiet and provide reason to closely watch the activity from week to week.
    • Brief Western Great Basin (BWGB) Report << discontinued 10/01/02
        This is the earthquake report that started it all. While many used to think earthquakes stopped at the California/Nevada border, this report single-handedly changed that perception in 1992 when the first Seismo-Watch earthquake report appeared in a local newspaper, the Reno Gazette Journal. The region has been the site of 24 earthquakes registering M 6.0 or stronger in the last 150 years, including five in the M 7.0 range, and earthquake activity measuring M 1.0 or stronger rarely falls below 10 quakes-per-week.
    • Pacific Northwest (PNW) Report << discontinued 7/20/02
        In 2001, the Puget Sound was rocked by the Nesqually M 6.8 earthquake. Although it was centered at more than 50 km (+30 miles) beneath the surface, substantial damage occurred throughout the region. It emphasized that while background seismicity is relative weak, producing between 5-30 M 1.0+ quakes-per-week, significant temblors do happen from time to time. Add in the potentially active Cascade volcanoes, whose earthquake swarms can jump at a moments notice, this area provides never-ending excitiment.


    Seismo-Watch has unprecedented access to a number of earthquake sources all over the world and has produced various global, regional, and local earthquake reports during the past decade of service:

    • Global (M 5.0+)
    • Pacific Northwest - Comprehensive Report (British Columbia to Oregon, including the offshore seismic zones)
    • Northern California Comprehensive Report (CA/OR border to Parkfield, including offshore seismic zones)
    • Western Basin and Range Comprehensive Report (CA/NV border region from Idaho to Ridgecrest, CA, not including Las Vegas, NV)
    • Intermountain Seismic Belt Comprehensive Report (Montana to Arizona, including Yellowstone inset)
    • New Madrid fault zone (Illinois to Arkansas)
    • Northern New England (New Brunswick, Canada, to Pennsylvania)
    • Hawaiian Islands
    • Alaska and the Aleutians
    • Seismo-Watch Newsletter / EQNews Magazine
      These pages are no longer maintained. Links to other reports will be provided as time permits.

    If you are interested in sponsoring any or all of these reports, please contact right away.

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