Bosco's RockPile

Recorded in Soquel · Regional earthquake

M3.4 earthquake near Brentwood, CA, September 12, 2026, recorded in Soquel

98 km (61 miles) from the Soquel seismic station — confirmed against the USGS catalog.

Magnitude (USGS)M3.4
Location (USGS)9 km SW of Brentwood, CA
Origin timeSeptember 12, 2026 at 12:25 AM PDT
2026-09-12 07:25:55 UTC
Distance from Soquel98 km · 61 miles
Peak ground motion at Soquel2,156 counts (raw amplitude — how hard the ground moved here, not the earthquake's size)
StationEQ-1 short-period seismograph, Soquel, Santa Cruz County, California — about six miles from the 1989 Loma Prieta epicenter
VerifyUSGS catalog, ±10 minutes around this origin

What this page is. The station's automated detector flagged a burst of ground motion at this time, and matching it against the USGS ANSS catalog identified it as this earthquake. Magnitude and location are USGS's — a single home station cannot compute them. The one thing measured here is how hard the ground in Soquel moved.

The live helicorder — what the ground is doing right now

This is the same instrument, live. The 24-hour trace below shows current ground motion in Soquel, refreshed every five minutes. September 12, 2026 has scrolled off this window; the recording of that day lives in the station catalog.

Live Helicorder · Seismic Activity ● Live · updates every 5 min
Live 24-hour helicorder trace from the Soquel seismic station
Each horizontal line is 60 minutes of ground motion — time runs left to right, top to bottom. Darker traces mean stronger motion. A 24-hour rolling window recorded by a home station in Soquel, California, refreshed here automatically every five minutes. Click the chart to open it full-size and read the timestamps and traces.