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The peak horizontal acceleration (PHA) is the most commonly used type of ground acceleration in engineering applications. It is often used within earthquake engineering (including seismic building codes ) and it is commonly plotted on seismic hazard maps. [ 6 ]
The earthquake had a maximum CWA seismic intensity of 6- in Chiayi County, 5- in Tainan and Kaoshiung, and 4 in Yunlin, Taitung, Nantou, Pingtung, Hualien, Changhua, Taichung and Penghu Counties, as well as in Chiayi City. [4] At Dapu, Chiayi, a maximum peak ground acceleration of 2,104.96 gal (2.15 g) was recorded by a CWB station. [7]
In 1904, Adolfo Cancani proposed adding two additional degrees for very strong earthquakes, "catastrophe" and "enormous catastrophe", thus creating a 12-degree scale. [6] His descriptions being deficient, August Heinrich Sieberg augmented them during 1912 and 1923, and indicated a peak ground acceleration for each degree.
The epicenter of the moment magnitude 6.7 (M w) blind thrust earthquake was beneath the San Fernando Valley. [3] Lasting approximately 8 seconds and achieving the largest peak ground acceleration of over 1.7 g, it was the largest earthquake in the area since 1971.
The earthquake was also felt by residents in Tokyo and across the Kanto Region [25] and as far as Aomori Prefecture in the northern tip of Honshu to Kyushu in the south of the country. [50] A peak ground acceleration of 2,826 gal was observed in Shika, which was close to that recorded during the 2011 Tohoku earthquake which measured 2,934 gal. [55]
The peak ground acceleration generally exceeded 0.5 g in a large area around the epicenter, near Adiyaman and a large part of Hatay. High pga values of 2 g were recorded in Hatay. [ 40 ] The maximum recorded pga was 2.212 g at a station in Pazarcık Belediyesi Parkı, Pazarcık; a government health facility nearby had limited damage but the ...
Seismic intensity scales categorize the intensity or severity of ground shaking (quaking) at a given location, such as resulting from an earthquake.They are distinguished from seismic magnitude scales, which measure the magnitude or overall strength of an earthquake, which may, or perhaps may not, cause perceptible shaking.
Peak ground velocity (PGV) and peak ground acceleration (PGA) are measures of the force that causes destructive ground shaking. [76] In Japan, a network of strong-motion accelerometers provides PGA data that permits site-specific correlation with different magnitude earthquakes.