Tsunami warning in Mexico, how did the tsunami form?

Tsunami is a powerful and destructive wave. In addition to earthquakes, submarine volcanic eruptions, submarine collapses and landslides can also cause tsunamis. Tsunami is a catastrophic wave, usually caused by an undersea earthquake, with a focal point less than 50 kilometers below the seabed and a magnitude of 6.5 or above on the Richter scale. Underwater or coastal landslides or volcanic eruptions may also trigger tsunamis. After an impact, the shock wave travels far away in an expanding circle on the sea surface, just like a pebble falling into a shallow pool. Tsunami is a destructive wave caused by submarine earthquake, volcanic eruption, submarine landslide or meteorological change. The wave speed of tsunami is as high as 700 ~ 800 kilometers per hour, and it can cross the ocean in a few hours. Wavelength can reach hundreds of kilometers, can spread thousands of kilometers, and energy loss is small; In the vast ocean, the wave height is less than one meter, but in the shallow sea coast, the wavelength decreases and the wave height increases sharply, reaching tens of meters, forming waves with great energy. Water wall? Tsunamis can be divided into three types:? Earthquake tsunami, landslide tsunami, volcanic tsunami. Earthquake and tsunami are strong fluctuations of sea water caused by seabed topography, and they fluctuate violently when earthquakes occur in Haiti. There are two formal mechanisms: descent? Tsunami and? Uplift? Tsunami. The descending tsunami is a large-scale sharp decline of the seabed crust caused by some tectonic earthquakes. At first, the seawater suddenly rushed to the sinking space, and a large-scale seawater accumulation appeared above it. The submerged seawater encounters resistance at the bottom of the sea, and immediately returns to the sea surface to generate compression waves, forming long waves and waves, which spread around. Its manifestation is low tide. Uplift Tsunami Some tectonic earthquakes caused the seabed crust to rise sharply in a large scale, and the seawater also rose with the uplift area, and large-scale seawater accumulation appeared above the uplift area. Under the action of gravity, the seawater must maintain an equipotential surface to achieve relative balance, so the seawater diffuses from the wave source area to the surrounding areas, forming turbulent waves. The tsunami wave formed by this uplift-type submarine crustal movement is manifested in the form of climax.