The U.S. Geological Survey says the Friday morning quake was centered about 48 miles (78 kilometers) north-northeast of Loreto, in the waters between the states of Baja California Sur and Sonora.

The USGS reports that it struck at a depth of 6 miles.

The area is a desert coastline dotted with small towns and fishing villages popular with U.S. tourists who park their recreational vehicles at seaside campsites.

Yolanda Vallejo, owner of Rivera del Mar RV Park in Loreto, said the quake didn’t even give her a start.

“We’ve felt similar earthquakes,” she said. “No damage. My plates didn’t even fall over.”

A powerful magnitude-8.1 earthquake shook southern Mexico back in Septemberthat left 32 people dead, brought down buildings and triggered tsunami warnings.

Source: https://www.nytimes.com/2018/01/19/us/california-today-100-million-dead-trees-prompt-fears-of-giant-wildfires.html

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The USGS reported the quake was relatively shallow at a depth of 6.2 miles (10 km).

Kim Nate, a dispatcher at the Bear Lake County Sheriff’s Office near the epicenter, said chairs and blinds “wiggled” but there were no calls reporting damage.

Reporting by Will Dunham and Keith Coffman; Editing by Bill Trott and Mary Milliken

Source: http://www.reuters.com/article/us-quake-idaho/magnitude-5-3-earthquake-hits-southeastern-idaho-usgs-idUSKCN1BE005

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The Sumatra-Andaman plate boundary is a collision zone between the Indo-Australian and Sunda plates. This subduction zone extends for over 8,000 km and has been responsible for large, damaging, historic earthquakes. For example, in 2004, a M=9.1-9.3 earthquake struck off of Banda Aceh. This earthquake ruptured a ~1,600 km-long portion of this plate boundary, and the shaking and ensuing tsunami killed over 200,000 people. In addition to this great earthquake, there have been several M=7.3+ earthquakes in this region since 2000

What the above figure from Caltech shows is that the weekend’s earthquake occurred on the edge of the rupture zone of the 2007 M=8.4 earthquake. While just a hypothesis, this could mean that the earthquake over the weekend was a very late aftershock. What is also interesting is that there is a large gap between the two 2007 ruptures and the 2005 M=8.6 rupture zone. If one looks at the two Temblor maps above, you will see that there is not a large amount of seismicity in this region, while to the south, there is. While this could be purely coincidental, it is worth noting as it could be indicative of differences in subduction along the plate boundary.

Based on the Global Earthquake Activity Rate (GEAR) model, the weekend’s earthquake should not be considered surprising. This model, which is availbale in Temblor, uses global strain rates and the last 40 years of earthquakes to determine the likely earthquake magnitude in your lifetime anywhere on earth. From the figure below, one can see that for this part of Indonesia, a M=7.0+ earthquake is likely. This highlights the earthquake potential, and thus the hazard of this region.

Source: http://temblor.net/earthquake-insights/m6-4-sumatra-earthquake-a-possible-aftershock-of-a-2007-m8-4-quake-4840/

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