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The pyroclastic flow reaches almost the whole area of Kyushu, and volcanic ash is deposited over 15 cm in a wide area from Kyushu to southern Hokkaido. There are three VEI-7 volcanoes in Japan. These are the Aira Caldera, Kikai Caldera and Aso Caldera. Mount Aso is the largest active volcano in Japan. Mount Aso had four eruptions 300,000 to ...
The earliest known earthquake in the U.S. state of California was documented in 1769 by the Spanish explorers and Catholic missionaries of the Portolá expedition as they traveled northward from San Diego along the Santa Ana River near the present site of Los Angeles. Ship captains and other explorers also documented earthquakes.
Seismic observations in Japan began in 1872. In 1884, Sekiya Seikei, Director of the Earthquake Division under the Home Ministry, compiled the 18-article "Earthquake Report Guidelines" and initiated data collection from 600 county offices nationwide. This was Japan’s first unified seismic intensity scale.
Multiple notable earthquakes have struck the United States this year, including a powerful quake in California and a historic event on the East Coast earlier in 2024. Strong earthquakes can lead ...
The JMA announced the Earthquake Early Warning hit (accuracy) rate for the 2011 fiscal year on 31 May 2012. The hit rate is the percentage of warnings issued immediately on the detection of P-waves with a Japan Meteorological Agency seismic intensity scale (震度, shindo) number (0 to 7) within one shindo number of the measured earthquake.
A powerful earthquake struck central Japan on Monday, killing at least six people, destroying buildings and knocking out power to tens of thousands of homes. Situated on the "Ring of Fire" arc of ...
TOKYO (AP) — A powerful earthquake struck off southern Japan on Thursday, causing mostly minor injuries but raising the level of concern over possible major quakes stemming from an undersea ...
In Japan, the Shindo scale is commonly used to measure earthquakes by seismic intensity instead of magnitude. This is similar to the Modified Mercalli intensity scale used in the United States, the Liedu scale used in China or the European Macroseismic Scale (EMS), meaning that the scale measures the intensity of an earthquake at a given location instead of measuring the energy an earthquake ...