• Leak surge and pipe failures detected following earthquakes in San Ramon Valley, California

    A cluster of underground pipe failures has been detected in San Ramon and surrounding East Bay communities, California, following a sequence of earthquake swarms active in the area since 2025. The incidents include fractured water and sewer lines, often identified only after prolonged leakage periods and abnormal water usage. Experts consider ground movement associated with recent seismic activity as a possible contributing factor, although causation has not been confirmed.

  • Earthquake swarm in San Ramon continues with multiple events on December 15, California

    An earthquake swarm that began near downtown San Ramon, California, in October remained active on December 15, with three earthquakes recorded within a few hours by the U.S. Geological Survey. The swarm is occurring in a structurally complex fault zone near the Calaveras Fault, where stress is released through repeated small ruptures rather than a single larger earthquake.