Leave your feedback Share Copy URL https://realcad.org/video/?vid=KFJs6BQMqHe Email Facebook Twitter LinkedIn Pinterest Tumblr Share on Facebook Share on Twitter While Everyone Watched Japan, This Fault Started Moving [ItoQEwU2hnf] Health Updated on August 05, 2026 EDT — Published on August 05, 2026 EDT While the world was watching Japan on Tuesday, a fault most Californians have never heard of moved for the second time in five weeks. The USGS logged more than 160 seismic events within hours of a magnitude 4.3 earthquake near Cloverdale, California — and flagged it as the potential mainshock of an active sequence. This fault runs directly toward the Bay Area, and its buried geological record holds earthquakes considerably larger than anything in its modern catalog. The Maacama fault produced its largest recorded earthquake, a magnitude 5.6, on June 24th near Ukiah. Thirty-four days later, it produced this new sequence 55 kilometers to the south. Neither event caused significant damage. But the fault's paleoseismic record — preserved in sediment near Willits — points to earthquakes in the magnitude 6.5 to 7 range within the last 1,200 years. And this fault connects structurally to the Hayward-Rodgers Creek system, which runs directly beneath the East Bay. This isn't a story claiming a big earthquake is coming — the statistics say it almost certainly isn't. It's a story about what the data actually shows, and what to watch for next. In this documentary, you'll discover: Why USGS flagged this as a "potential mainshock" rather than an isolated quake. What creep is, and why it doesn't fully protect this fault from earthquakes. How this connects structurally to the fault running beneath the Bay Area. Why ShakeAlert couldn't have warned residents in time during June's earthquake. Whether this week's Japan earthquake and this sequence are actually connected. What to watch in the aftershock map over the coming days. Join us as we break down exactly what's happening on one of Northern California's least-known, and potentially most consequential, fault systems. 💬 Had you heard of the Maacama fault before today? Let me know in the comments. 👍 Like, Subscribe, and turn on Notifications for more real, fact-first coverage of the forces shaping our planet. Sources: U.S. Geological Survey (USGS) — Earthquake Sequence products 2023 National Seismic Hazard Model (deformation model) Science Advances — Hayward-Rodgers Creek fault connection study (2016) Journal of Geology (2013) — Northern California Coast Ranges fault mapping DJfBsPmdH9b kvvDUQmaDR0 s9GtXPYvJXu WCiJsLHkrTI WF8HX8KdE3I FErdLQCEUbP
While the world was watching Japan on Tuesday, a fault most Californians have never heard of moved for the second time in five weeks. The USGS logged more than 160 seismic events within hours of a magnitude 4.3 earthquake near Cloverdale, California — and flagged it as the potential mainshock of an active sequence. This fault runs directly toward the Bay Area, and its buried geological record holds earthquakes considerably larger than anything in its modern catalog. The Maacama fault produced its largest recorded earthquake, a magnitude 5.6, on June 24th near Ukiah. Thirty-four days later, it produced this new sequence 55 kilometers to the south. Neither event caused significant damage. But the fault's paleoseismic record — preserved in sediment near Willits — points to earthquakes in the magnitude 6.5 to 7 range within the last 1,200 years. And this fault connects structurally to the Hayward-Rodgers Creek system, which runs directly beneath the East Bay. This isn't a story claiming a big earthquake is coming — the statistics say it almost certainly isn't. It's a story about what the data actually shows, and what to watch for next. In this documentary, you'll discover: Why USGS flagged this as a "potential mainshock" rather than an isolated quake. What creep is, and why it doesn't fully protect this fault from earthquakes. How this connects structurally to the fault running beneath the Bay Area. Why ShakeAlert couldn't have warned residents in time during June's earthquake. Whether this week's Japan earthquake and this sequence are actually connected. What to watch in the aftershock map over the coming days. Join us as we break down exactly what's happening on one of Northern California's least-known, and potentially most consequential, fault systems. 💬 Had you heard of the Maacama fault before today? Let me know in the comments. 👍 Like, Subscribe, and turn on Notifications for more real, fact-first coverage of the forces shaping our planet. Sources: U.S. Geological Survey (USGS) — Earthquake Sequence products 2023 National Seismic Hazard Model (deformation model) Science Advances — Hayward-Rodgers Creek fault connection study (2016) Journal of Geology (2013) — Northern California Coast Ranges fault mapping DJfBsPmdH9b kvvDUQmaDR0 s9GtXPYvJXu WCiJsLHkrTI WF8HX8KdE3I FErdLQCEUbP