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What size earthquake can you feel?

The magnitude, location, and depth of an earthquake, and overlying soil conditions determine how widely and strongly any particular event can be felt. Typically, people report feeling earthquakes larger than about magnitude 3.0.

usgs.gov - Felt"" Earthquakes = Ones That People Feel | U.S. Geological Survey

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Please Report Felt Earthquakes

HVO needs your help! When you feel an earthquake, please share your experience to help the USGS map the shaking. Even if you did not feel the earthquake, your 'not-felt' response provides important information. Your reports fill in gaps between instruments that record shaking. They also contribute to more complete earthquake assessments and provides valuable data for further earthquake research. Go to the USGS Earthquake Hazards program "Did You Feel It?" webpage. Under the "DYFI, Past 24 Hours" heading, select the earthquake you felt. If it's not there, click the "Report an Unknown Event" button above the earthquake list. Fill out the DYFI questionnaire and click "Submit." It's that simple!

Both "magnitude" and "intensity" describe earthquake size.

There are two ways to describe the size of an earthquake. Magnitude characterizes the amount of energy released by an earthquake at its source. The energy released is determined by measuring the amplitude or duration of earthquake waves recorded by a seismometer. Magnitude numerical values are calculated using a modern formulation of the Richter Scale. These values are assigned to an earthquake, independent of location. Intensity describes the effects of shaking on people and structures. An earthquake's intensity is determined by collecting felt reports or by measuring the actual shaking of the ground. Intensity values are assigned using the Modified Mercalli Intensity Scale. Unlike magnitude, intensity may vary greatly from one place to another for a given earthquake. Intensity values are usually, but not always, highest near an epicenter and decrease with distance from the source.

Learn more from the USGS Earthquake Hazards Program.

The Modified Mercalli Intensity (MMI) Scale assigns intensities as Roman numerals based on observed effects. (Public domain.)

Earthquake intensity can be shown with different types of maps.

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. (Public domain.) 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. Community 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. CIIM show average intensity values for each zip code region from which a report is received. The more felt reports received for your ZIP code, the more reliable will be the average intensity assigned to that ZIP code. Information in CIIMs is particularly useful to fill in geographic gaps where there are few seismic stations. Learn more about DYFI. ShakeMaps are another type of earthquakeintensity map made by the USGS. These maps show a combined ground motion and shaking intensity for earthquakes with magnitudes of 3.5 or higher in Hawaii. They incorporate measurements of ground acceleration and velocity recorded by seismic instruments and felt reports submitted through DYFI. ShakeMaps, therefore, offer more complete pictures of the shaking produced by earthquakes. They are used by federal, state, and local organizations for post-earthquake response and recovery efforts and public and scientific information, as well as for preparedness exercises and disaster planning. Learn more about ShakeMap.

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What are the top 5 earthquakes for number of deaths?

It produced large tsunamis (up to 5 meters/16 feet high), which is the cause of the deaths. Maule(Chile) Earthquake (2010)– 8.8. Kamchatka, Russia Earthquake (1952) – 9.0. Tōhoku Earthquake (2011) – 9.1. Sumatra Earthquake (2004)– 9.1. Great Alaska Earthquake (1964)– 9.2. Valdivia Earthquake (1960)– 9.5.

geologyscience.com - 10 Most Powerful Earthquakes in Earth History - Geology Science

10. Sumatra Earthquake (2012)– 8.6

on 11 April ,2012 at 15.38 local time, Indian Ocean earthquakes were magnitude 8.6 undersea that near of Indonesian city of Aceh. Authorities were at tsunami call but subsequently cancelled .These were unusually strong intraplate earthquakes and the largest strike-slip earthquake ever recorded. it occurred very remote from an inhabited place and produced no destructive tsunami (10 cm to 0.8 meter / 3.9 inches to 31.4 inches tsunamis were reported). 10 deaths and 12 injuries were reported – most of them caused by panic and/or heart attack.

9. Assam-Tibet Earthquake (1950) – 8.6

On August 15, 1950, Earthquake occured at Xizang-India border region and epicenter of earthquake located near Rima,Tibet, Result of earthquakes many buildings were destroyed and between 1.500 and 3.000 peaple were killed. After the earthquake, large landslides blocked the Subansiri River. This natural dam broke 8 days later, creating a wave of 7 m (23 ft) high which inundated several villages and killed 536 people.

The earthquake also created around 5,000,000 homeless.

8. Rat Islands Earthquake(1965) – 8.7

The 1965 Rat Islands Earthquake occurred at 05:01 UTC, on February 4 (19:01, February 3, in local time). It triggered a tsunami of over 10 meters (33 feet) on Shemya Island, Alaska, but thanks to its distant location, caused very little damage.

7. Ecuador-Colombia Earthquake(1906)– 8.8

The 1906 Ecuador–Colombia earthquake occurred at 15:36 UTC on January 31, off the coast of Ecuador, near Esmeraldas (a coastal city in northwestern Ecuador). It produced large tsunamis (up to 5 meters/16 feet high), which is the cause of the deaths.

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