Jones said two of the bigger quakes in historic time closest to Monday’s swarm, a magnitude 6.9 earthquake in 1940 and a magnitude 6.4 quake in Imperial Valley in 1979, came without any preceding swarm of small earthquakes. This week’s lineup in the virtual Festival of Books 2020 features conversations with Natalie Portman, Kevin Kwan, Marlon James and Maria Hinojosa. This story was automatically generated by Quakebot, a computer application that monitors the latest earthquakes detected by the USGS. [21], During two outings in late 1979 and early 1980 several researchers (including Thomas H. Heaton and John G. Anderson) examined the region near the New River and discovered ground disturbances that were related to the Brawley aftershock. These differences in strength allowed damage to be concentrated in one or more areas rather than being distributed equally and reduced the building's ability to sustain the tremors. Coronavirus is surging in college towns. Rong-Gong Lin II is a metro reporter based in San Francisco who specializes in covering statewide earthquake safety issues and the COVID-19 pandemic. Texas. The worst spot? Two of the irregularities of the building were the end shear walls that stopped below the second floor and the first floor carrying its load via square support columns. If you thought going it alone was odd before, well.... They’re key allies of Benjamin Netanyahu. Most COVID-19-era entertainment is geared toward social and family bubbles. The 1979 Imperial Valley earthquake occurred at 16:16 Pacific Daylight Time (23:16 UTC) on 15 October just south of the Mexico–United States border. [5], The earthquake caused damage to the Californian cities of El Centro and Brawley, and in the Mexican city of Mexicali Mexico. Scientists are closely watching the cluster, which began at 6:07 p.m. Monday with a magnitude 2.8 quake, followed six minutes later by the largest quake so far, a magnitude 4. The earthquake was 6.5 on the Mw scale, with a maximum perceived intensity of IX (Violent) on the Mercalli intensity scale. A Times editor reviewed the post before it was published. Did you feel this earthquake? That magnitude 6.4 earthquake caused $30 million in damage, injured 91 people, and damaged more than 1,500 homes and over 400 commercial buildings. Endorsement: The Times endorses Hoffman, Anderson, Henderson and Han for LACCD. Where to vote. A magnitude 4.0 earthquake was reported at 6:13 p.m. Monday. A magnitude-3.6 earthquake was reported at 12:53 p.m. Tuesday 11 miles from El Centro, Calif., according to the U.S. Geological Survey. The California Highway Patrol warned drivers that use of the road would be at their own risk. [14], Several types of irregular construction styles were incorporated into the building that contributed to its mass and strength not being uniform throughout the structure. How San Francisco became a COVID-19 success story as other cities stumbled. It is currently run by Casey Miller, a journalist on The Times’ Data and Graphics Department. How to vote. Even if you didn’t feel this small earthquake, you never know when the Big One is going to strike. Several strands of the Brawley fault zone, to the east of the Imperial fault, ruptured intermittently along a length of 11.1 km (6.9 mi), and just one kilometer of the Rico fault slipped with a maximum vertical displacement of 20 cm (7.9 in) (no horizontal slip was observed on that fault). Similar effects were also reported across the border in Calexico. A swarm of small earthquakes has struck near the California-Mexico border, centered beneath the town of El Centro in Imperial County. [9], The earthquake was caused by rupture along parts of the Imperial Fault, the Brawley fault zone and the Rico Fault, a previously unknown normal fault near Holtville, though slip was also observed on the Superstition Hills Fault and the San Andreas Fault. [15], The earthquake shaking also led to extensive damage to the irrigation systems of the Imperial Valley, leading to breaches in some canals, particularly the All-American Canal that brings water to the valley from the Colorado River. Activity in that area of the valley had been aseismic through 1978, and a few events occurred just prior to the event, and a significant increase in the amount of activity followed the mainshock.

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