A decade of seismicity reveals the strangely symmetrical distribution of earthquake clusters located beyond the ends of the 1872 Mw~7.6 earthquake. Both clusters enclose mixtures of hot springs, and extensional (‘normal’) faults and strike-slip faults, as well as sporadic eruptions in the past 12,000 or so years. Because of the hot springs, both have geothermal power plants. Several M>6 shocks struck in the 1980’s in the northern cluster, and several M~5 quakes struck in the 1990’s in the southern cluster.
- What’s happening this week in Humboldt County, California: The squeeze - February 6, 2019
- Finding of the unexpected tsunami due to the strike-slip fault at central Sulawesi, Indonesia on 28 September 2018, from the preliminary field survey at Palu - October 15, 2018
- California bill (AB 2681) to create a public inventory of collapse-risk buildings is awaiting Gov. Brown’s signature - September 7, 2018