The combination of the earthquake’s location, radiated seismic energy, and the very foundations of Mexico City – thick, loose soils that behave like a bowl of jelly during earthquakes – created the conditions for devastation. Since the plates there seem to break rules followed by plate boundaries elsewhere around the world, the local rules need to be better understood. The tectonic plate boundary known as a subduction zone, where an oceanic plate dives down beneath another plate. A deadly magnitude-8.2 earthquake struck the southern coast of Mexico on 7 September, killing dozens of people and injuring at least 200. The 7.1 magnitude earthquake, 19 September. 2017 earthquake off Mexico broke through an entire tectonic plate Magnitude 8.2 in Mexico involved more fault movement than thought possible. If the 8.1 tremor raised eyebrows, then Tuesday’s magnitude 7.1 earthquake left everyone stunned. Mexico City’s potent 2017 earthquake was a rare ‘bending’ quake – and it could happen again March 12, 2018 10.34am EDT • Updated September 19, 2018 3.48pm EDT The Gulf of Tehuantepec lies above the convergent boundary where the Cocos Plate is being subducted below the North American Plate at a rate of 6.4 cm/yr (2.5 in/yr).. Background. If building structures are improved, early warning systems continue to be implemented and the public is educated about what action to take to protect themselves when the warning sirens sound, then cities located in earthquake-prone areas will be making good progress to better protect their infrastructure and people during future quakes. Its epicenter was about 55 km (34 mi) south of the city of Puebla. In June 1999, a M 7.0 at 70 km depth, just to the southeast of the September 19, 2017 earthquake, caused 14 fatalities, around 200 injuries, and considerable damage in the city … The explanation here is that as the oceanic plate disappears beneath the continent, it sinks downward into the mantle. All rights reserved. - Mexico City honors earthquake victims in Day of the Dead parade ... "It is not one single sharp plate boundary, but there are numerous fracture zones," Dahm explains. As you bend it, the skin stretches around the outside of your elbow, but relaxes on the inside as your forearm and bicep come together. This final kink in the Cocos plate is located right where the 7.1 earthquake happened, and directly beneath the Valley of Mexico, in which Mexico City is located. Within 250 km of the September 19, 2017, earthquake there … A powerful earthquake struck off the coast of Mexico early this morning and was felt as far away as Mexico City, reports said, the New York Times reports. Mexico is located on one of Earth's subduction zones, where the ocean floor of the Cocos tectonic plate is forcing its way down ("subducting") beneath the continental edge of the North American plate. 370 people were killed by the earthquake and related building collapses, including 228 in Mexico City, and more than 6,00… The two earthquakes occurred within just 11 days of each other and both were within the sinking Cocos plate. Occasional earthquakes within this bending, sinking plate can reflect that stretching. Ad Choices. The magnitude-8.2 quake damaged buildings in Mexico City. A magnitude 8.2 earthquake that struck southern Mexico on Sept. 7, 2017, not only occurred where existing earthquake modeling said it shouldn't happen, it also broke a tectonic plate… two earthquakes that struck Mexico this month. Mexico’s Huge 2017 Earthquake Split A Tectonic Plate In Two, Baffling Geologists. This earthquake occurred on the anniversary of the devastating 1985 M 8.0 Michoacan earthquake, which caused extensive damage to Mexico City and the surrounding region. People from as far away as Mexico City felt the shaking from this deep quake, many of whom evacuated their buildings, spilling out into plazas and open space… Mexico City was given 10-15 seconds of warning during the magnitude 7.1 earthquake. subduction zone, Mexico City is subjected to both interplate (epicenter at plate boundary) and intraplate (epicenter inside the continental plate) earthquakes. Mexico is adjacent to a plate tectonic boundary. Protecting people during earthquakes is all about minimizing surprises, so while they are always interesting, we want to limit the earthquakes that make you go "Huh.". The earthquake’s epicentre was unusually located, in central Mexico. First, seawater percolating down into the cracks that formed as the oceanic plate first bent to head beneath the continent could have cooled the rock and reacted with minerals, making the rock more brittle than it would be otherwise. Vertically, the portion of the fault that slipped starts at the top of the oceanic plate—about 15km below the Earth’s surface—and continues all the way down to a depth of about 80km, which is roughly the bottom of the plate. Tuesday’s earthquake occurred near this interface along the tectonic plate boundary known as the Middle American Trench, just offshore at a shallow depth 13.7 miles (22.6 kilometers) according to SSN. Let’s not pull on your wrist hard enough to stretch your elbow joint, but doing so would counteract the squeezing on the inside of your elbow as it bends. The equations for the physics of all this tell us that the fault movement should have been restricted to the upper half of the oceanic plate. Our detailed earthquake records from instruments only go back a hundred years or so, and these deep quakes do not leave any noticeable imprint in the geological record from surface ruptures or large tsunamis. Not only do these earthquakes produce dangerous shaking, but if they occur close enough to the point on the seafloor where the two plates meet, they can push up seawater and create a tsunami wave. This earthquake comes just 12 days after major M8.1 quake near the coast of Chiapas, Mexico and on the anniversary of the devastating 1985 M8.0 … According to the U.S. Geological Survey, the epicenter of the earthquake took place in Raboso, Mexico—about 75 miles south of the capital city. The epicentre of the quake was 120 km southeast of Mexico City, 12 km southeast of the city of Axochiapan, Morelos on the boundary between Puebla and Guerrero. Following its head-on collision with the North American plate (to which Mexico belongs), the Cocos plate (a piece of crust beneath the Pacific Ocean) gradually sinks deeper into the earth under its own weight. DOI: 10.1038/s41561-018-0229-y (About DOIs). So, it is difficult to tell where and when these types of ruptures have occurred in the past. So there is no immediate indication that these two quakes are directly linked. Mexico city, the country’s capital, is especially prone to earthquakes because it is situated on top of an ancient lake bed. Rescuers work in the rubble after a magnitude 7.1 earthquake struck on September 19, 2017 in Mexico City, Mexico ... of Mexico, and the North American tectonic plate. 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