Shear Wave Velocity (Vs)

Vs30

The average shear-wave velocity between 0 and 30-meters depth. Some Attenuation Relationships require knowing whether a Vs30 value was Measured or Inferred. More information is available at the USGS Global Vs30 Map Server site

Depth 1.0 km/sec

The depth (km) to where shear-wave velocity = 1.0 km/sec (the first occurrence if more than one depth exists).

Depth 2.5 km/sec

The depth (km) to where shear-wave velocity = 2.5 km/sec (the first occurrence if more than one depth exists).