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USGS Seismologist David Shelly To Receive AGU’s Macelwane Medal


USGS Seismologist David Shelly To Receive AGU’s Macelwane Medal

MENLO PARK, Calif. — USGS research seismologist David Shelly will receive the 2012 Macelwane Medal from the American Geophysical Union for his revolutionary advances in understanding the nature of tectonic tremor and its role in the earthquake preparation process.

Shelly, stationed in Menlo Park, Calif., is an internationally recognized leader in the study of tectonic (non-volcanic) tremor associated with major plate-boundary faults, and the implications of tremor for the state and physical processes governing the recurrence of major earthquakes produced by these faults. His innovations in the study of this subtle “noise” from deep within the earth have opened a new window into the processes governing the earthquake cycle on major plate-boundary faults and the magmatic systems beneath active volcanoes. 

“We try to use recordings of ground vibration from very small earthquakes to learn about the conditions and active processes in places we can’t directly access, deep in the earth,” Shelly explained.

Shelly’s research is vital in identifying and determining the risk of earthquake and volcano hazards and in finding ways to build more resilient communities. He is now applying his seismology expertise to studying the deep-rooted volcanic system of Long Valley Caldera near Mammoth, Calif., which may lead to insights into the future hazards posed by this system and help to identify magma movements in the build-up to an eruption.

Established in 1961, the Macelwane Medal is awarded annually for significant contributions to the geophysical sciences by an outstanding early-career scientist. Shelly will be honored at the AGU’s fall meeting Dec. 3-7 in San Francisco.

Shelly joined USGS in 2008 as a Mendenhall Postdoctoral Fellow with the Earthquake Hazards Team and is currently with the USGS Volcano Science Center in Menlo Park. In 2011, he was named one of President Obama’s recipients of the Presidential Early Career Award for Scientists and Engineers, the highest honor bestowed by the U.S. government on science and engineering professionals in the early stages of their independent research careers. He received his Ph.D. in geophysics in 2007 from Stanford University.

 

USGS Newsroom


More information

Parameter Value Description
Magnitude mb The magnitude for the event.
Longitude ° East Decimal degrees longitude. Negative values for western longitudes.
Latitude ° North Decimal degrees latitude. Negative values for southern latitudes.
Depth km Depth of the event in kilometers.
Place Textual description of named geographic region near to the event. This may be a city name, or a Flinn-Engdahl Region name.
Time 1970-01-01 00:00:00 Time when the event occurred. UTC/GMT
Updated 1970-01-01 00:00:00 Time when the event was most recently updated. UTC/GMT
Timezone offset Timezone offset from UTC in minutes at the event epicenter.
Felt The total number of felt reports
CDI The maximum reported intensity for the event.
MMI The maximum estimated instrumental intensity for the event.
Alert Level The alert level from the PAGER earthquake impact scale. Green, Yellow, Orange or Red.
Review Status Indicates whether the event has been reviewed by a human.
Tsunami This flag is set to "1" for large events in oceanic regions and "0" otherwise. The existence or value of this flag does not indicate if a tsunami actually did or will exist.
SIG A number describing how significant the event is. Larger numbers indicate a more significant event.
Network The ID of a data contributor. Identifies the network considered to be the preferred source of information for this event.
Sources A comma-separated list of network contributors.
Number of Stations Used The total number of Number of seismic stations which reported P- and S-arrival times for this earthquake.
Horizontal Distance Horizontal distance from the epicenter to the nearest station (in degrees).
Root Mean Square sec The root-mean-square (RMS) travel time residual, in sec, using all weights.
Azimuthal Gap The largest azimuthal gap between azimuthally adjacent stations (in degrees).
Magnitude Type The method or algorithm used to calculate the preferred magnitude for the event.
Event Type Type of seismic event.
Event ID Id of event.
Event Code An identifying code assigned by, and unique from, the corresponding source for the event.
Event IDS A comma-separated list of event ids that are associated to an event.

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