a maximum ground motion of 1 millimeter (mm) at 100 km distance. Structural engineers usually contribute information for assigning intensity values of VIII or above. The magnitude is the most often cited measure of an earthquakes size, but it is not. Dizziness and nausea are experienced by some people. Vibration is felt like one passing of a light truck. Base-10 logarithmic scale obtained by calculating logarithm of the. Felt by many people indoors especially in upper floors of buildings. While the Mercalli scale describes the intensity of an earthquake based on its. The higher numbers of the scale are based on observed structural damage. Still Water in containers oscillates noticeably. Significance = max(mag_significance, pager_significance) + dyfi_significance Īny event with a significance > 600 is considered a significant event and appears on the list. The lower numbers of the intensity scale generally deal with the manner in which the earthquake is felt by people. Mag_significance = magnitude * 100 * (magnitude / 6.5) pager_significance = red is 2000 : orange is 1000 : yellow is 500 : green is 0 dyfi_significance = min(num_responses, 1000) * max_cdi / 10 Events in this list and shown in red on our real-time earthquake map and list are considered “significant events’, and they are determined by a combination of magnitude, number of Did You Feel It responses, and PAGER alert level. 1-3, 1966, 1967, 1969: The Prince William Sound, Alaska, Earthquake of 1964 and Aftershocks, Publication 10-3 (in three volumes), Washington, D.C.
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