Rmanwaring at 20:50, 20 December 2022

2022-12-20T20:50:12Z

← Older revision		Revision as of 20:50, 20 December 2022
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	Field measurements of shear wave velocity can be obtained by several different methods:		Field measurements of shear wave velocity can be obtained by several different methods:
	*Destructive methods:		*Destructive methods:
	**Down- hole (and Up-hole)		**Down-hole (and Up-hole)
	**Cross hole		**Cross hole
	**Seismic Piezo cone (SCPT)		**Seismic Piezo cone (SCPT)

Grichards: Created page with "NOTOC Category: Geologic and Tectonic Setting ---- The velocity structure is a generalized model of the earth’s crust using layers having different assumed seismic velocities. It is important in a SHA to have a well-defined velocity structure. Several parameters (''V_S30'', ''Z1.0'', ''Z2.5'') are used in most attenuation relationships. The most important parameter is ''V_S30'', which is defined as the shear wave velocity in the top 30 m..."

2022-12-14T23:55:02Z

Created page with "__NOTOC__ Category: Geologic and Tectonic Setting ---- The velocity structure is a generalized model of the earth’s crust using layers having different assumed seismic velocities. It is important in a SHA to have a well-defined velocity structure. Several parameters (''VS30'', ''Z1.0'', ''Z2.5'') are used in most attenuation relationships. The most important parameter is ''VS30'', which is defined as the shear wave velocity in the top 30 m..."

New page

__NOTOC__
[[Category: Geologic and Tectonic Setting]]
----
The velocity structure is a generalized model of the earth’s crust using layers having different assumed [[seismic]] velocities. It is important in a SHA to have a well-defined velocity structure. Several parameters (''VS30'', ''Z1.0'', ''Z2.5'') are used in most attenuation relationships. The most important parameter is ''VS30'', which is defined as the shear wave velocity in the top 30 meters. This can be estimated based on surface geology or geotechnical data, or directly measured in the field. The preferred approach for detailed design would be directly measured in the field, with more preliminary analyses using estimates from the literature.

Field measurements of shear wave velocity can be obtained by several different methods:
*Destructive methods:
**Down- hole (and Up-hole)
**Cross hole
**Seismic Piezo cone (SCPT)
*Non Destructive methods:
**Seismic Refraction
**Spectral Analysis of Surface Waves (SASW)
**Multichannel Analysis of Surface Waves (MASW)


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Velocity Structure - Revision history

Rmanwaring at 20:50, 20 December 2022