![]() ShakeMaps, therefore, offer more complete pictures of the shaking produced by earthquakes. ![]() They incorporate measurements of ground acceleration and velocity recorded by seismic instruments and felt reports submitted through DYFI. These maps show a combined ground motion and shaking intensity for earthquakes with magnitudes of 3.5 or higher in Hawaii. ShakeMaps are another type of earthquakeintensity map made by the USGS. ![]() Information in CIIMs is particularly useful to fill in geographic gaps where there are few seismic stations. The more felt reports received for your ZIP code, the more reliable will be the average intensity assigned to that ZIP code. CIIM show average intensity values for each zip code region from which a report is received. USGS Community Internet Intensity Map for the Kīholo Bay earthquake (star marks location) on October 15, 2006, beneath the northwest coast of the Island of Hawai‘i.Ĭommunity Internet Intensity Maps (CIIM) are color-coded maps reflecting intensity-the effects of an earthquake-as described by reports submitted by people through the Did You Feel It? webpage. USGS Community Internet Intensity Map for the Kīholo Bay earthquake (star marks location) on October 15, 2006, beneath the northwest coast of the Island of Hawai‘i. Learn more from the USGS Earthquake Hazards Program. Intensity values are usually, but not always, highest near an epicenter and decrease with distance from the source. Unlike magnitude, intensity may vary greatly from one place to another for a given earthquake. Intensity values are assigned using the Modified Mercalli Intensity Scale. An earthquake's intensity is determined by collecting felt reports or by measuring the actual shaking of the ground. Intensity describes the effects of shaking on people and structures. These values are assigned to an earthquake, independent of location. Magnitude numerical values are calculated using a modern formulation of the Richter Scale. The energy released is determined by measuring the amplitude or duration of earthquake waves recorded by a seismometer. Magnitude characterizes the amount of energy released by an earthquake at its source. There are two ways to describe the size of an earthquake. ![]() Fill out the DYFI questionnaire and click "Submit." It's that simple!īoth "magnitude" and "intensity" describe earthquake size.If it's not there, click the "Report an Unknown Event" button above the earthquake list. Under the "DYFI, Past 24 Hours" heading, select the earthquake you felt.Go to the USGS Earthquake Hazards program " Did You Feel It?" webpage. ![]()
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