mexico city earthquake 2017 plate boundary

Mexico has had an implementation of an earthquake early warning system for years, developed after the 1985 earthquake that devastated Mexico City. Ad Choices. The material on this site may not be reproduced, distributed, transmitted, cached or otherwise used, except with the prior written permission of Condé Nast. The two earthquakes that struck Mexico this month were different. The reasonably shallow depth suggested that this particular part of the Pacific Ring of Fire does not behave as we expect. This is partly because hotter temperatures at greater depths make the rock less brittle and partly because the inside of the bend in the plate should be feeling squeezing rather than stretching. And second, the sinking portion of the oceanic plate must be pulling downward pretty hard. The location of the 8.1 magnitude earthquake, 7 September. 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. We are often reminded about the force and devastation from earthquakes that occur around the Pacific Ring of Fire. As the Cocos plate plunges deeper into the bowels of our planet, fractures inside the slab bend and pull apart. In this region, the oceanic Cocos plate dives beneath the North America and Caribbean plates to form the Middle America Trench, a subduction zone with a rich history of very large M>8 earthquakes (Ye et al., 2013). This quake in Chile occurred at a similar depth, with a similar faulting mechanism, and beneath a highly populated area in a sedimentary basin, similar to the two recent Mexico earthquakes. That means that earthquakes along that boundary are typically the result of compressive force that squeezes rock to slide up the plane of the fault. © 2021 Condé Nast. The two earthquakes occurred within just 11 days of each other and both were within the sinking Cocos plate. Building code design response spectra in Mexico City for 1976, 1987, and 2004 in the: (a) Firm The magnitude-8.2 quake damaged buildings in Mexico City. 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. Mexico City was given 10-15 seconds of warning during the magnitude 7.1 earthquake. 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. Available for everyone, funded by readers. Soil zones from the 2004 Mexico City building code. If the 8.1 tremor raised eyebrows, then Tuesday’s magnitude 7.1 earthquake left everyone stunned. 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… A new study led by the University of Oregon’s Diego Malgar found something even weirder, though. 2017 earthquake off Mexico broke through an entire tectonic plate Magnitude 8.2 in Mexico involved more fault movement than thought possible. 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 … Yet its depth, pinpointed to 70km down, raised eyebrows. Mexico, was one of the first countries, along with Japan, to develop an earthquake early-warning system. The 1985 earthquake was the more typical great earthquake that breaks the boundary between the plates, and caused great devastation in Mexico City despite being more than 100 … The magnitude-8.0 quake occurred at 7:18 am.Many sources place the location of the epicentre in the state of Michoacán—approximately 200 miles (320 km) from Mexico City—in a region of tectonic tension between the North American Plate and the subducting Cocos Plate. Mexico City's downtown area is notoriously vulnerable to earthquakes … 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. The explanation here is that as the oceanic plate disappears beneath the continent, it sinks downward into the mantle. The researchers say a couple additional factors must be at play. A major earthquake registered by the USGS as M7.1 hit Puebla, Mexico at 18:14 UTC (13:14 local time) on September 19, 2017. This warping of the Cocos plate caused a large earthquake to occur close to Mexico city at a relatively shallow depth. The M8.0 1985 Michoacan earthquake was an interplate event where the seismic waves traveled more than 350 km before reaching Mexico City. 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. The earthquake’s epicentre was unusually located, in central Mexico. Preliminary calculations show that because the earthquakes occurred more than 600km from each other, the first rupture would have only increased stress on Tuesday’s ruptured fault by a tiny amount. It occurred at the Cocos Plate rather than at the boundary with the North American plate. - 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. In this case the rupture took place inside a plate itself, not at the locked zone between plates. Based on previous scientific studies, the slab begins to behave as normal at shallow depths, but then it suddenly flattens for a distance of around 200 km, before again plunging into the deep Earth. Seismologist Dr Stephen Hicks explains, Dr Hicks is a postdoctoral research fellow in seismology at the University of Southampton. 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. The movement started at a spot about 46km down and spread outward along the plane of the fault from there. Mexico’s Huge 2017 Earthquake Split A Tectonic Plate In Two, Baffling Geologists. Look around to make sure no one’s watching, and then stare at your elbow. 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. While the two earthquakes were not connected, they were the same type of earthquake, which is unusual in the region. The world’s largest recorded earthquake, which struck Chile in 1960, was not the country’s most damaging earthquake. A magnitude 8.2 on September 8 just offshore the state of Chiapas was followed by a magnitude 7.1 on September 19—this time much closer to Mexico City, causing considerable destruction there. Since the plates there seem to break rules followed by plate boundaries elsewhere around the world, the local rules need to be better understood. 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. 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. Counter to what we thought possible, the fault seems to have broken clean through the entire tectonic plate. 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. two earthquakes that struck Mexico this month. Explaining this little puzzle has practical implications. 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 … 2017 earthquake off Mexico broke through an entire tectonic plate September 2017 saw a pair of weird earthquakes in Mexico. All rights reserved. The 7.1 magnitude earthquake, 19 September. subduction zone, Mexico City is subjected to both interplate (epicenter at plate boundary) and intraplate (epicenter inside the continental plate) earthquakes. So there is no immediate indication that these two quakes are directly linked. Thu 21 Sep 2017 06.53 EDT Last modified on Thu 5 Oct 2017 11 ... the shallow portion of the tectonic plate boundary. 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 Mexico city, the country’s capital, is especially prone to earthquakes because it is situated on top of an ancient lake bed. 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 movement started at a relatively shallow depth Dr Hicks is a postdoctoral research fellow in seismology at the plate. 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