How is the strength of an earthquake measured? The USGS also has received nearly 17,000 reports through the internet from throughout the northeastern United States.

Higher intensities, commonly VI, were reported closer to the epicenter, mostly in Kent County, many of the reports associated with shaking of dishes, teapots, and lamps. It may feel similar to vibrations from the passing of a truck.Īs of Dec 15, 2017, the Delaware Geological Survey website had received approximately 260 'felt reports' from individuals in and around Delaware, with an average intensity reply between Mercalli III and IV. An intensity of III is commonly quite noticeable to persons indoors, especially on upper floors of buildings, but in many people may not recognize it as an earthquake. Dishes, windows, and doors may be disturbed walls make cracking sound and the earthquake may have a sensation like heavy truck striking a building. An intensity of IV is generally associated with light shaking that is felt by many indoors but not as commonly felt outdoors. Reports compiled on the internet by the USGS and DGS indicate a Modified Mercalli Intensity of IV felt closest to the epicenter and III around most of the region. The Delaware earthquake of 2017 was felt in locations throughout the state and along the eastern seaboard from central Virginia to Massachusetts. How was this earthquake felt in Delaware and surrounding areas? The DGS seismic station located in Greenville in New Castle County was the first station to receive the seismic wave from this earthquake. These stations provide publically available, real-time data on seismic signals (or wave energy generated by earthquakes) that occur. How did Delaware Geological Survey scientists confirm that an earthquake had occurred?ĭGS operates a network of seismic stations in the state of Delaware to monitor earthquakes and feeds data into the Lamont Doherty Seismographic Network as well as to the U.S. Analysis of the shaking associated with the Dover earthquake indicates that the source was approximately 3 km (10,000 ft) beneath the land surface in deep crystalline basement rocks and had a predominantly strike-slip direction of motion (side-ways movement along a fault zone) with a significant thrust component (some upward movement along the fault), probably along a deep pre-existing fault related to the past tectonic episodes. with an epicenter located 6 miles northeast of Dover in Bombay Hook National Wildlife Refuge, according to data reported by the U.S. The magnitude 4.1 temblor occurred at 4:47 p.m. Links to earthquake-related information for each state.The largest measured earthquake to occur within Delaware was recorded on November 30, 2017. Information by state, and world seismicity maps. Use real-time web services for your own applications. Get real-time earthquake notifications sent to you on your phone or by email, or subscribe to real-time feeds.

Real-time Notifications, Feeds, and Web Services Various output formats, and links to earthquake details. View historic seismicity, find past earthquakes that meet your criteria. USGS and non-USGS collections of earthquake-related features and effects and shaking damage. Special Earthquakes, Earthquake Sequences, and Fault ZonesĬompilations of information about significant earthquakes, swarms or sequences, and fault zones of interest. Largest earthquakes, significant events, lists and maps by magnitude, by year, or by location. Tap/click on 'gear icon' for options and settings. Photo by Peter Haeussler, USGS, November 9, 2002. Peter Haeussler prepares to measure the offset of a crevasse on the Canwell Glacier, Alaska, USA.

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