Determining A 1-D velocity model of the uppermost crust from P and S arrival times using the neighbourhood algorithm: synthetic test

Title:

Determining A 1-D velocity model of the uppermost crust from P and S arrival times using the neighbourhood algorithm: synthetic test

Creator:

Jaromír Janský, Vladimír Plicka, and Oldřich Novotný

Identifier:

https://cdk.lib.cas.cz/client/handle/uuid:905ab577-bfa2-4a6c-8456-7c3fbe5ec46f
uuid:905ab577-bfa2-4a6c-8456-7c3fbe5ec46f
issn:1214-9705

Subject:

Geologie. Meteorologie. Klimatologie, geodynamika, geodynamics, synthetic test, uppermost crust, arrival-time inversion, Neighbourhood Algorithm, grid search, 7, and 551

Type:

article, články, model:article, and TEXT

Format:

print, bez média, and svazek

Description:

Using synthetic data we study the possibility of determining 1-D velocity models of the upper crust from P- and S-wave arrival times in the case of a narrow depth interval of seismic sources and sparse distribution of stations. The test is tailored to a similar real situation in one subregion of the western part of the Corinth Gulf, Greece. Two kinds of models are studied: (i) models composed of layers with constant velocity gradients, and (ii) models composed of homogeneous layers. To derive the structural models from arrival times, the Neighbourhood Algorithm of Sambridge (1999) is used, combined with the grid search for source locations. Weighted P- and S-wave arrival time residuals are used as the misfit function. Accurate and perturbed synthetic arrival times are used. The velocities at medium depths, with a fast velocity increase, are well determined in both models for the accurate data. However, the determination of velocity is less certain in the uppermost 5 km for the gradient model, and in the deepest layer for the model composed of homogeneous layers for the perturbed data. The presence or absence of hypocentres in the uppermost or in the second layer influences notably the obtained velocity in these layers in both models., Jaromír Janský, Vladimír Plicka and Oldřich Novotný., and Obsahuje bibliografii

Language:

English

Rights:

http://creativecommons.org/licenses/by-nc-sa/4.0/
policy:public

Source:

Acta geodynamica et geomaterialia : | 2007 Volume:4 | Number:2 (146)

Harvested from:

CDK

Metadata only:

false