   Mexico City | |
| UTC time | 1964-07-06 07:22:13 |
|---|---|
| ISC event | 865780 |
| USGS-ANSS | ComCat |
| Local date | July 6, 1964 |
| Local time | 01:22 |
| Magnitude | 7.2 Mw [1] |
| Depth | 92 km (57 mi) [1] |
| Epicenter | 18°11′N100°31′W / 18.19°N 100.51°W [1] |
| Areas affected | Mexico |
| Casualties | 40 killed |
The 1964 Guerrero earthquake occurred on July 6 at 01:22 local time in Guerrero, Mexico. The magnitude of this earthquake was given as Ms 7.4, [2] or ML 7.2. [3]
In the nearby region, the Cocos Plate is subducting beneath the North American Plate, however, this was an intraplate earthquake. [4]
The earthquake affected the states of Guerrero and Michoacán. Forty deaths were reported. [5] The most affected places included Ciudad Altamirano, Cutzamala, Coyuca de Catalán, Tanganhuato, and Huertamo. [3] The earthquake was also felt strongly and caused panic in Mexico City. [6]
Coyuca de Catalán was seriously damaged. The city hall was destroyed. The majority of the houses there were seriously damaged and became uninhabitable. There were great cracks on the ground. [7]
The term intraplate earthquake refers to a variety of earthquake that occurs within the interior of a tectonic plate; this stands in contrast to an interplate earthquake, which occurs at the boundary of a tectonic plate. Intraplate earthquakes are often called "intraslab earthquakes", especially when occurring in microplates.
An interplate earthquake is an earthquake that occurs at the boundary between two tectonic plates. Earthquakes of this type account for more than 90 percent of the total seismic energy released around the world. If one plate is trying to move past the other, they will be locked until sufficient stress builds up to cause the plates to slip relative to each other. The slipping process creates an earthquake with relative displacement on either side of the fault, resulting in seismic waves which travel through the Earth and along the Earth's surface. Relative plate motion can be lateral as along a transform fault boundary, vertical if along a convergent boundary or a divergent boundary, and oblique, with horizontal and lateral components at the boundary. Interplate earthquakes associated at a subduction boundary are called megathrust earthquakes, which include most of the Earth's largest earthquakes.
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Episodic tremor and slip (ETS) is a seismological phenomenon observed in some subduction zones that is characterized by non-earthquake seismic rumbling, or tremor, and slow slip along the plate interface. Slow slip events are distinguished from earthquakes by their propagation speed and focus. In slow slip events, there is an apparent reversal of crustal motion, although the fault motion remains consistent with the direction of subduction. ETS events themselves are imperceptible to human beings and do not cause damage.
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The 1965 Oaxaca earthquake occurred in Mexico on August 23 at 13:46 with a moment magnitude of 7.5. Five people were reported dead in Mexico City and one in Oaxaca. There was an anomalous change in seismic activities before the earthquake. There was a quiescent stage from late 1963 to mid-1964, and it was followed by a renewal of seismic activities before the main shock. This earthquake was a shallow thrust earthquake in the interplate subduction zone, in which the Cocos Plate is subducting beneath the North American Plate.
The 1937 Orizaba earthquake occurred on July 26 at 03:47 UTC, near Orizaba, Veracruz, Mexico. It had a magnitude of 7.3 on the surface wave magnitude scale. Thirty four people were reported dead. Damage was reported in Esperanza, Puebla. This was an intraplate earthquake within the subducting Cocos Plate.
The 1911 Guerrero earthquake occurred on December 16 at 12:14 local time near the coast of Guerrero, Mexico along the Mexican subduction zone. The earthquake's energy was calculated using several different magnitude scales with an estimated moment magnitude of 7.6 and a surface wave magnitude of 7.8. Following the event, telegraphy reports came in from a broad area of Mexico. Cities from Guadalajara, Mérida, and Tapachula all reported the tremors. The earthquake lasted over two minutes and resulted in the deaths of 28 people.
The 1932 Jalisco earthquakes began on June 3 at 10:36 UTC with a megathrust event that registered 8.1 on the moment magnitude scale. With a maximum perceived intensity of X (Extreme) on the Mercalli intensity scale, at least 400 deaths were caused in Mexico and neighboring Guatemala. It was the first of a series of seismic events that affected parts of western Mexico during the month of June 1932, all reaching magnitude 7 or greater.
The 1942 Guatemala earthquake occurred at 17:37 local time on August 6 and had ratings of 7.7 on the moment magnitude scale and 7.9 on the surface wave magnitude scale. The epicenter was located off the southern coast of Guatemala, and it was one of the strongest earthquakes ever recorded there.
The 1981 Playa Azul earthquake occurred on October 24, 1981, at 21:22 local time. It was located near Playa Azul, Michoacán, Mexico. The magnitude of the earthquake was Mw 7.2, or Ms 7.3. Three deaths were reported, two from Michoacán and one from Mexico City. Some buildings were damaged in both Michoacán and Mexico City. A small tsunami was registered in Acapulco with a maximum height of 9 cm.
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The 1787 New Spain earthquake, also known as the San Sixto earthquake, occurred on 28 March at 11:30 local time. It caused a large tsunami that affected the coast of the Puebla Intendancy and the Oaxaca Intendancy in Southwestern New Spain. With an estimated magnitude of 8.6 on the moment magnitude scale, it was more powerful than any instrumentally recorded Mexican earthquake.
The 1982 Ometepec earthquake that struck Mexico's southwestern coast near Ometepec (Guerrero) on 7 June was a doublet earthquake that ruptured in two steps. The first happened at 06:52 UTC, the second five hours later at 10:59 UTC. Estimated magnitudes are 6.9 and 7.0 on the Ms scale, and 5.8 and 6.0 on the mb scale. The maximum Mercalli intensities were VII and VIII, respectively.
The 1957 Guerrero earthquake occurred on 28 July at 08:40 UTC. It had a magnitude of 7.6 Mw and a maximum perceived intensity of VII on the Modified Mercalli intensity scale. Mexico City and Chilpancingo were particularly badly affected. It caused the deaths of between 54 and 160 people. A small tsunami was triggered but caused little damage.
The 1920 Xalapa earthquake was the deadliest earthquake in Mexico's history prior to 1985. It occurred on January 3 at 22:25 local time, killing between 648 and 4,000 people. Deadly mudflows and landslides were triggered, destroying buildings in rural towns across Veracruz and Puebla. More than 400 perished as a result of the mudflows and landslides. The earthquake was attributed to a shallow fault in the Trans-Mexican Volcanic Belt. It measured magnitude 6.3–6.4 and had a hypocenter depth of <15 km (9.3 mi). The Mexican government took immediate action in the aftermath—providing assistance and establishing communication services. The aftershocks were studied by scientists and is widely regarded as the first scientific study of aftershocks following a major earthquake.
The 1979 Petatlán earthquake, also known as the IBERO earthquake occurred on March 14 at 05:07 local time in the Mexican state of Guerrero. The earthquake had a surface wave magnitude of Ms 7.6 or moment magnitude of Mw 7.4 and maximum Modified Mercalli intensity of VIII (Severe). The epicenter, onshore, was located 12 km south southeast of Vallecitos de Zaragoza.
A moment magnitude Mw 7.0 or 7.1 earthquake occurred near the city of Acapulco in the Guerrero state of Mexico at 20:47 local time on 7 September with an estimated intensity of VIII (Severe) on the MMI scale. The earthquake killed 13 people and injured at least 23 others. At least 1.6 million people in Mexico were affected by the earthquake which resulted in localized severe damage. The earthquake occurred on the anniversary of the 2017 Chiapas earthquake which measured Mw 8.2. It was also the largest earthquake in Mexico since the 2020 Oaxaca earthquake.
The 1912 Acambay earthquake struck the State of Mexico on 19 November at 07:55 local time. It had a moment magnitude of 6.7–6.9 Mw and an epicenter near the town of Acambay, 80 km (50 mi) northwest of Mexico City. Up to 161 people died and there was severe destruction. It is regarded as one of the most important earthquakes in Mexico's seismological history, having been widely studied.
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