Modified Mercalli Intensity Scale

The seismic intensity is defined as the severity of earthquake ground motion, or displacement, at the time of earthquake and is evaluated using the modified Mercury intensity scale (MMI). This scale is a good indicator of the impact and impact of an earthquake on the environment and its population. It is based on three characteristics, human perception, building performance, and change in the natural environment MMI is usually associated with maximum ground acceleration (PGA), as shown in the table, vibration of the ground It is used to quantify the severity of.

The improved Mercury seismic intensity scale performs seismic assessment at the seismic intensity level from I to XII. According to this scale, people are difficult to walk at the VI level. At the seventh level, they are difficult to stand. On the ninth floor, carefully-built buildings suffered considerable damage. Most of Tangshan city and surrounding villages have experienced XI (Yong 44). Moreover, even the best building in Tangshan can only withstand the maximum vibration of 17 (13). Figure 4 shows the spatial distribution of seismic activity.

Seven levels of vibration intensity of JMA 5 (MMI VII to VIII) - Iwakuni, Hikone, Kyoto, Toyooka, and JMA 4 (MMI) are assigned to the coastal area of ​​Suma area from Nishinomiya to Awaji Island . VI) To Nara, Okayama, Osaka, Takamatsu, Shikoku, Wakayama. This page shows the distribution of the maximum horizontal acceleration and velocity recorded in the Kansai region, and it was corrected according to the map of the University of Tokyo Earthquake Research Institute. According to the report of the Kansai earthquake observation research committee, records of acceleration and speed are added to this map. Maximum horizontal acceleration is the maximum horizontal acceleration reported by several different mechanisms and represents a combination of up to two peak horizontal accelerations or two horizontal component vectors.