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_sliprt | Char (15) | Slip Rate is obtained when the amount of offset is divided by the time interval. Normalized to millimeters per year (mm/yr) |
| eqf_type | Char (25) | Fault type based on fault location |
| eqf_sldrcd | Char (15) | Slip direction The next two characters of the four-character code 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 the fault dip which is the angle that the fault is inclined from the horizontal plane |
| eqf_state | Char (2) | State in which the Soil Classification Polygon centroid falls within the State boundary (note some polygons bordering the coast may have a null State value) |
| pml_zonegrade | Char (2) | Probable Maximum Loss Zone Grade – Currently only from the State of Californial |
| eqs_nehrp | Char (2) | Modified NEHRP Classification Note: Pitney Bowes has adopted a modified NEHRP
soil type classification, based on the 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 to New Madrid Fault region |
| 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 |