The Great Chile Earthquake of 1960 was the largest earthquake ever recorded at a magnitude of 9.5 on the Richter scale. It struck the city of Valdivia, Chile on May 22, 1960, generating tsunamis that caused damage and loss of life across the Pacific in Japan, Hawaii, and the Philippines. The earthquake was caused by the convergence of the Nazca plate sliding under the South American plate along the plate boundary, a process that had been occurring for millions of years. It resulted in over 2,000 deaths in Chile, widespread damage, and left millions homeless.
A 9.0 magnitude earthquake struck off the coast of Tohoku, Japan on March 11, 2011. This triggered a massive tsunami with waves as high as 10 meters. Over 15,000 people were killed by the tsunami, mostly by drowning, and thousands more were injured or missing. The earthquake and tsunami also caused widespread damage to buildings and infrastructure, as well as triggering a nuclear meltdown at the Fukushima Daiichi power plant. International aid was provided to help with search and rescue efforts and recovery.
Mount Pinatubo, located in the Philippines, erupted in 1991 after a period of increased seismic activity. The eruption ejected ash up to 34km into the atmosphere, covering over 125,000km2 in ash and destroying 800km2 of agricultural land. Over 800,000 livestock were killed and 1.2 million people lost their homes. Pyroclastic flows and lahars (volcanic mudflows) caused additional damage. International aid and relocation efforts helped respond to the eruption, but lahars continued to impact the area for years. The hazard is now managed through monitoring, hazard maps, and building designs to mitigate future lahar impacts.
This document provides information about earthquakes, including what causes them, different types of faults, seismic waves, measuring earthquake intensity, effects of earthquakes, and preparedness and response. It explains that earthquakes are caused by a sudden slip along a fault due to built up stresses in the earth's crust. There are three main types of faults - strike-slip, thrust, and normal - depending on the type of plate motion and rock. When an earthquake occurs, seismic waves are generated including body waves (P and S waves) and surface waves (Love and Rayleigh waves). Earthquake intensity can be measured using the Mercalli scale or Richter magnitude scale. Earthquakes can cause damage through ground shaking, landslides