Bedrock Geologic Map of the Windham Quadrangle, Rockingham and Hillsborough Counties, New Hampshire: General description

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Description The bedrock geology of the 7.5-minute Windham quadrangle, New Hampshire consists of deformed early Paleozoic crystalline metamorphic and intrusive igneous rocks intruded by Mesozoic igneous dikes. The geologic data was mapped during the summer of 1998 at
Originators Walsh, Gregory J. and Clark, Stewart F., Jr.
Publication U.S. Geological Survey Open-File Report 99-8

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earthquake location data

Label Definition
DATE YYMMDD of earthquake, Universal Time Coordinated
TYPE refers to central US velocity model used to locate earthquake
HR origin time hour, Greenwich Universal Time Coordinated
MIN origin time minute
SEC origin time seconds with partial seconds
LAT location, latitude north
LONG location, longitude W
DEPTH location, depth in kilometers
DEPTAG tag for free or fixed depth in location routine
MAG magnitude, computed from averaged displacement magnitudes at each station
NSTA number of stations used to determine earthquake location
NPHASE number of p- and s- phases used to determine earthquake location
GAP largest aperture between stations recording earthquake, in degrees
DMIN epicentral distance to closest station, in km
RMS Root Mean Square of travel-time residuals after location algorithm iterations
ERH standard error of horizontal location in km
ERZ standard error of depth in km
QH quality of horizontal location, based on evaluation of ERH, RMS, NSTA, and NPHAS
QZ quality of depth location, based on evaluation of ERZ, RMS, NSTA, and NPHASE
MOD code for velocity model used to compute earthquake location
DFLAG (no definition)
MBLG3 magnitude determined from Lg surface waves