Earthquake Data Fields

Field Name Field Type Description
pbkey Char(17) A unique address identifier that is returned when an address match is made using the Master Location Dataset.
eq_r0 Integer Count of R0 events*
Note: Eq_R* describes aggregate earthquake event data in the United States. The R numbers correspond to the Magnitude Scale.
eq_r1 Integer Count of R1 events*
eq_r2 Integer Count of R2 events*
eq_r3 Integer Count of R3 events*
eq_r4 Integer Count of R4 events*
eq_r5 Integer Count of R5 events*
eq_r6 Integer Count of R6 events*
eq_r7 Integer Count of R7 events*
eq_r0_ge Integer Count of events >= R0*
eq_r1_ge Integer Count of events >= R1*
eq_r2_ge Integer Count of events >= R2*
eq_r3_ge Integer Count of events >= R3*
eq_r4_ge Integer Count of events >= R4*
eq_r5_ge Integer Count of events >= R5*
eq_r6_ge Integer Count of events >= R6*
eq_r7_ge Integer Count of events >= R7*
eqf_name Char (80) Name of fault
eqf_dist Double Distance to closest fault in miles (up to 5 decimal precisions)
eqf_sliprt Char (15) Amount of offset divided by time interval, normalized to millimeters per year (mm/yr).
eqf_type Char (25) Fault type based on fault location
eqf_sldrcd Char (15)

Four-character code with the first two characters indicating earthquake fault. The next two characters describe the slip direction:

  • _ = no data

  • C_ = center

  • E_ = east

  • LL = left lateral

  • N_ = north

  • NE = northeast

  • NW = northwest

  • RL = right lateral

  • S_ = south

  • SE = southeast

  • SW = southwest

  • W_ = west”
eqf_age Char (30) Age of fault in years
eqf_slpsns Char (15) Angle of dip of the fault and the relative direction of movement across the fault.
eqf_dipdir Char (15) General direction of fault dip, which is the angle at which the fault is inclined from the horizontal plane.
pml_zonegrade Char (2) Probable Maximum Loss Zone Grade – Currently only available for the state of California
eqs_nehrp Char (2) Modified NEHRP Classification
Note: Pitney Bowes has adopted a modified NEHRP soil type classification, based on Site Classification Based on Geological Genesis by Wen et al. (2008). For more information refer to the Modified NEHRP Classification table below.
eqs_index Double Numeric value representing NEHRP classification
newmadrid_dist Double Numeric value representing distance from the New Madrid Fault region
Table 1. Modified NEHRP Classification
Modified NEHRP Classification Numerical Index Shear-wave Velocity (Vs) (m/s) Description
B 1 >760 Most volcanic, plutonic, metamorphic and coarse grained sedimentary
BC 1.5 555-1000 Vretaceous siltstones or mudstone
C 2 360-760 Sedimentary rocks of Oligocener to Cretaceous age or younger coarse grained sedimentary rocks
CD 2.5 270-555 Sedimentary rocks of Miocence and younger age.
D 3 180-360 Younger alluvium
DE 3.5 90-270 Fine grained alluvial and estuarine deposits along the coast
E 4 <180 Intertidal mud