California & West Coast On High Alert After Magnitude 4.0 Earthquake Hits San Andreas Fault

Bridget Mulroy

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California & West Coast On High Alert After Magnitude 4.0 Earthquake Hits San Andreas FaultPhoto by(@temmuzcan/iStock)

California, Washington, and the United States west coast have been alerted following six shallow earthquakes occurring within the last twenty-four hours. Shallow earthquakes have a greater impact potential than deeper earthquakes because the waves from deeper quakes have more space to travel and weaken before they reach the surface. With shallow quakes, the impact is felt instantly at the surface level.

California, Oregon, and Washington have a new ‘MyShake’ app system that acts as an early earthquake detection system along the San Andreas. Since the documented earthquakes have taken place in a region accustomed to seismic activity, there is no need to panic. 

The following earthquakes have been documented by USGS and ALLQuakes, two of the few credible and globally-recognized seismic activity monitoring systems. UTC is an abbreviation for Coordinated Universal Time.

Magnitude 4.0 Earthquake Struck 112 km West of Petrolia, California: On 31 May 2023 at 7:59 PM UTC, a magnitude 4.0 earthquake struck Petrolia, California, at a depth of 10 km.

Magnitude 3.6 Earthquake Struck 15 km South Southeast of Port Hueneme, California: On 30 May 2023 at 8:24 PM UTC, a magnitude 3.6 earthquake struck Port Hueneme, California, at a depth of 13.6 km.

Magnitude 3.2 Earthquake Struck 200 km South of San Francisco, California: On 31 May 2023 at 2:12 PM UTC, a magnitude 3.2 earthquake struck south of San Francisco, California, at a depth of 5.6 km.

Magnitude 3.2 Earthquake Struck 25 km Southwest of Lone Pine, California: On 31 May 2023 at 12:52 AM UTC, a magnitude 3.2 earthquake struck Lone Pine, California, at a depth of 4.3 km.

Magnitude 3.1 Earthquake Struck 25 km Southwest of Lone Pine, California: On 31 May 2023 at 3:00 AM UTC, a magnitude 3.1 earthquake struck Lone Pine, California, at a depth of 2.5 km.

Magnitude 2.4 Earthquake Struck 13 km Southeast of Forks, Washington: On 30 May 2023 at 12:31 AM UTC, a magnitude 2.4 earthquake struck Forks, Washington, at a depth of 20 km.

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Hi, I’m Bridget. 👩🏻‍🔬 I’m based in: 📍 Manhattan, New York 📍 Red Bank, New Jersey 📍 Calabasas, California I cover geology, seismology, botany, biology, & community news. USGS Verified ✅ 🪨🌋🌱

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