Geological Survey (USGS) has a large number of high-quality broadband stations, expect computations of an Mwr consistently for events as small as M4.0. Source complexity and dimensions at larger magnitudes (~M7.0 or greater) generally limits applicability. Magnitude Types MwrĮquation: M w = 2/3 ✕ (log 10(M o) − 16.1), where M o is the seismic moment.īased on the scalar seismic moment of the earthquake, derived from moment tensor inversion of the whole seismogram at regional distances (~10–100 s pass band based on size of EQ). Station elevations are provided in meters (m) relative to sea level. Seismometer station locations for the current Ohio Seismic Network (2016–present day) are denoted by yellow stars locations are approximate. Modified Mercalli Intensities are also provided. For more information on earthquake magnitude types calculated for seismic events in Ohio, see below.Įarthquake depths are approximate and given in kilometers (km) below the land surface. Geological Survey and the Ohio Seismic Network, beginning in 1999.Įarthquake magnitudes are denoted by several seismic scales, such as M l (Richter, adjusted for locality), Md (Duration magnitude), and Mw (Moment magnitude). Red dots denote instrumentally located earthquakes from differing networks through time, such as the U.S.For more information, see Open-File Report 2017-01. Blue dots depict epicenters for historically located earthquakes, before the advent of seismic instrument recording, and may not reflect actual epicenter locations.Clicking a dot will open a window that provides detailed information about that earthquake, including magnitude, depth, and date and time. Reading the MapĮarthquake epicenters are represented by blue and red dots. The map is searchable using several parameters, including magnitude and year. This mapping application illustrates earthquake epicenters within the state of Ohio and numerous border-region earthquakes. Fall 2022 DNAP eNews - Prairie Restoration.
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