Glass 7.6 earthquakes in Mexico seas caused regional tsunami tsunami waves to reach 1 meter

one. Earthquake tsunami overview

The reporter learned from the Tsunami Early Warning Center of the Ministry of Natural Resources that according to the data of the Global Underwater Earthquake Monitoring, the Tsunami Warning Center of the Ministry of Natural Resources, 2:55 on September 20, 2022 (Beijing time), the offshore coast of Halisco, Mexico A magnitude 7.6 earthquake occurred in the sea area (18.40 ° N, 103.23 ° W), with a depth of the earthquake at 15.0 kilometers.

According to the latest monitoring results of the Ministry of Natural Resources, the earthquake has triggered a regional tsunami, and multiple tide stations around the earthquake monitors a tsunami wave of 0.1-1.0 meters. The process did not affect the coast of my country.

two. Overview of historical earthquake tsunami

The earthquake occurred at the boundary position of the Kokos Oceanic plate and the North American sector, and was the result of the role of the shallow backbone. The location, depth and earthquake source mechanism of the event are consistent with the deformation characteristics near the border between the two sections. The geological structure on the western coast of Mexico is often affected by the dive effect of the north east of the Kokos Oceanic plate. The dive rate is about 70 mm/year.

History earthquake tsunami distribution map

Historical earthquake data show that within 500 kilometers near the earthquake source, 27 seismic events have occurred within 500 kilometers near the earthquake source, and the biggest is the magnitude 8.1 earthquake that occurred on June 3, 1932. The global historical tsunami disaster database shows that there have been 41 tsunami incidents in this area in history, of which the most influential was the tsunami disaster caused by a magnitude 8.0 earthquake in 1995, the largest tsunami wave of 11 meters.

three. Observation survey situation

According to global water level monitoring data, the earthquake has caused regional tsunami volatility near the earthquake source. As of 9:30 on September 20, 2022 (Beijing time), multiple tide stations around the earthquake monitored 0.1-1.0 meters of tsunami waves. Lhasaro Kadas Station (17.9 ° N, 102.2 ° W) monitors 0.29 meters tsunami waves, Chi Waltanyo Station (17.6 ° N, 101.6 ° W) monitors 0.50 meters tsunami waves, Bayal Tatang Station (20.7 ° N, 105.2 ° W) monitors 0.19 meters of tsunami waves, Mansani Station (19.1 ° N, 104.3 ° W) monitors 0.93 meters of tsunami waves, Akaphacco Station (16.8 °) N, 99.9 ° W) monitored 0.30 meters tsunami waves.

Tsunami monitoring station distribution map

Four. Numeral Calculations

According to the results of the recent real -time shock source mechanism of the Grand Earthquake Earthquake, the earthquake is an inverse earthquake incident. The geometric parameters of the seizure mechanism are: the first section is 287 °, the inclination angle is 18 °, the sliding angle 86 is 86 °, the second section is 112 °, the inclination angle is 72 °, and the sliding angle is 91 °. According to the actual breakthrough geometry, the results obtained by the tsunami numerical model show that the earthquake may trigger a regional tsunami below 1.0 meters near the shore of the earthquake.

Numerical calculation result chart

five. Early warning information

The Tsunami Early Warning Center of the Ministry of Natural Resources issued the three tsunami warning information for the earthquake at 2:16, 4:10, and 9:20 Beijing time. In addition, the Pacific Tsunami Early Warning Center (PTWC) and the Northwest Pacific Tsunami Warning Center (NWPTAC) also released multiple tsunami warning information for the earthquake.

six. Disaster

The earthquake has triggered a tsunami around the source. According to data from the global disaster warning and coordination system, there are about 40,000 people within 100 kilometers of the epicenter. We will continue to follow the relevant disaster situations in the local casualties.

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