11/11/2014 — Earthquake Swarm at Lassen Volcano in Northern Calfornia

Right on schedule, an earthquake swarm has kicked up at Lassen Volcanic peak in Northeast California.

lassen swarm lassen

I said “right on schedule”…… meaning this new swarm at Lassen WAS EXPECTED.

How did we know this was going to occur?

To understand, please watch my earthquake forecast from November 7th here:

From the USGS:
Lassen Volcanic Center California (USA)

Volcano types:  Stratovolcano

Lava domes Summit Elev: 3187 m
Latitude: 40.492°N
Longitude: 121.508°W

“The Lassen volcanic center consists of the andesitic Brokeoff stratovolcano SW of Lassen Peak, a dacitic lava dome field, and peripheral small andesitic shield volcanoes and large lava flows, primarily on the Central Plateau NE of Lassen Peak.

A series of eruptions from Lassen Peak from 1914 to 1917 marks the most recent eruptive activity in the southern Cascade Range. Activity spanning 600,000 years began with construction of Brokeoff stratovolcano.

Beginning 400,000 years ago activity shifted to the north flank of Brokeoff, where episodic, more silicic eruptions produced a field of a dozen dacitic lava domes including Bumpass Mountain, Mount Helen, Ski Heil Peak, and Reading Peak.

At least 12 eruptive episodes took place during the past 100,000 years, with Lassen Peak being constructed about 28,000 years ago.

The Chaos Crags dome complex was constructed about 1100-1000 years ago north of Lassen Peak.

The Cinder Cone complex NE of Lassen Peak was erupted in a single episode several hundred years before present and is considered part of the Lassen volcanic center (Clynne et al., 2000).

The 1914-1917 eruptions of Lassen Peak began with phreatic eruptions and included emplacement of a small summit lava dome, subplinian explosions, mudflows, and pyroclastic flows.”

Largest event so far in the swarm was a 3.9M earthquake:


M3.9 – 24km WNW of Chester, California 2014-11-11 08:35:31 UTC

Event Time

  1. 2014-11-11 08:35:31 UTC
  2. 2014-11-11 00:35:31 UTC-08:00 at epicenter
  3. 2014-11-11 02:35:31 UTC-06:00 system time


40.400°N 121.492°W depth=0.1km (0.0mi)

Nearby Cities

  1. 24km (15mi) WNW of Chester, California
  2. 65km (40mi) N of Magalia, California
  3. 67km (42mi) ENE of Red Bluff, California
  4. 71km (44mi) W of Susanville, California
  5. 201km (125mi) NW of Carson City, Nevada