Earthquakes at Mendocino Triple Junction, California

Earthquakes at Mendocino Triple Junction, California

Five minor to moderately strong earthquakes were registered at Mendocino Triple Junction, west of Eureka, California at a depth of 10 km (6.2 miles) on May 5, 2019.

The strongest was M4.8 detected at 06:46 UTC on May 5. 

The sequence started with M3.1 at 04:17 UTC, followed by M3.3 at 06:29, M4.3 at 06:32, M4.8 at 06:46, and ended at 07:12 UTC with M3.2.

Earthquakes such as these are a common occurrence in this area. 

This is a juncture of three plates, the Gorda plate, the North American plate, and the Pacific plate, creating what seismologists call Mendocino Triple Junction (MTJ).

West Coast earthquakes detected on May 5, 2019. Credit: Google, TW/SAM. Data source: USGS

MTJ is the location of a change in the broad plate motions which dominate the west coast of North America, linking convergence of the northern Cascadia subduction zone and translation of the southern San Andreas Fault system.

The Gorda plate is subducting, towards N50ºE, under the North American plate at 2.5 – 3 cm per year (1 - 1.2 inches), and is simultaneously converging obliquely against the Pacific plate at a rate of 5 cm per year (1.9 inches) in the direction N115ºE.

The accommodation of this plate configuration results in a transform boundary along the Mendocino Fracture Zone, and a divergent boundary at the Gorda Ridge.

Featured image credit: Google, TW/SAM


Rare April snow falls in Brussels after unusually warm weather, Belgium

April 08, 2021

Snow fell in Brussels, Belgium, on Tuesday, April 6, 2021, which is considered an unusual weather event for this time of the year. The country, along with much of northwest Europe, previously experienced unusually warm weather and record temperatures at end of...

At least 3 dead, thousands of homes flooded as torrential rains hit Haiti

April 07, 2021

Torrential rains have been affecting Haiti since April 2, 2021, resulting in extensive damage and at least three fatalities. At least 149 homes have been damaged, with more than 1 270 properties still submerged in floodwaters. Persistent heavy rains have been...

Dusty winds and heavy rain hit north Qatar

April 07, 2021

Strong winds, rain, and dense dust hit Qatar over the weekend, leading to low visibility. According to the Qatar Meteorological Department, the wave of dust came from northwestern Arabia. The weather phenomenon was witnessed Saturday to Sunday, April 3 to 4. Heavy...

Strong and shallow M6.6 earthquake east of South Sandwich Islands, SW Atlantic Ocean

April 03, 2021

A strong and shallow earthquake registered by the USGS as M6.6 hit east of South Sandwich Islands, SW Atlantic Ocean at 01:16 UTC on April 3, 2021. The agency is reporting a depth of 10 km (6.2 miles). EMSC is reporting the same magnitude and depth. The epicenter...

Strong M6.3 aftershock hits Kermadec Islands region, New Zealand

April 01, 2021

A strong earthquake registered by the USGS as M6.3 hit the Kermadec Islands region, New Zealand at 09:56 UTC on April 1, 2021, at a depth of 10 km (6.2 miles). EMSC is reporting the same magnitude and depth. The epicenter was located about 960 km (597 miles) NE of...


Comments

No comments yet. Why don't you post the first comment?

Post a comment

Your name: *

Your email address: *

Comment text: *

The image that appears on your comment is your Gravatar