Moho reflections from strong near quarry blasts: an example for the central Ore Mountains, Czech Republic

Title:

Moho reflections from strong near quarry blasts: an example for the central Ore Mountains, Czech Republic

Creator:

Kampfová, Hana, Málek, Jiří, and Oldřich Novotný

Identifier:

https://cdk.lib.cas.cz/client/handle/uuid:fa3742fb-e0b9-4eff-8cad-69ba58e61c8d
uuid:fa3742fb-e0b9-4eff-8cad-69ba58e61c8d
issn:1214-9705

Subject:

Geologie. Meteorologie. Klimatologie, lomy, quarries, Krušné hory (Česko a Německo : oblast), Krušné hory Mountains Region (Czechia and Germany), Moho reflection, crustal thickness, quarry blast, 7, and 551

Type:

article, články, model:article, and TEXT

Format:

print, bez média, and svazek

Description:

The present paper describes a method for identification of reflected waves on the seismogr ams from a cluster of quarry blasts. These reflections are used for determination of the Moho depth. Only one seismic station is sufficient, but a cluster of seismic sources is needed. To increase the signal-to-noise ratio of reflected waves, several techniques are applied, such as filtering, polarisation analysis and stacking of seismograms. Th e method was tested on seismic data from the central part of the Ore Mountains region, Czech Republic. Seismic waves were generated by strong quarry blasts at the Tušimice open-pit coal mine, and recorded at the Přísečnice (PRI) temporal seismic station at an epicentral distance of about 16 km. As the station was equipped with a three-component seismograph, also S-wave onsets could be determined. Although Pg, Sg and surface waves dominate the seismograms, weak Moho reflections of P and S waves could also be recognized at travel times of 9.7 s and 17.3 s, respectively. From these times we found the mean ratio of the P- to S-wave ve locities in the crust to be 1.78. Considering P-wave velocity model of Beránek (1971), the observed travel times of the reflections yield a crustal thickness of 29.5 -n31.5 km, which agrees with recent receiver function studies. These agreements indicate that the proposed method of reflected seismic waves, generated by quarry blasts, could represent a simple way for mapping the Moho discontinuity., Hana Kampfová, Jiří Málek and Oldřich Novotný., and Obsahuje bibliografické odkazy

Language:

English

Rights:

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

Source:

Acta geodynamica et geomaterialia : | 2007 Volume:4 | Number:3 (147)

Harvested from:

CDK

Metadata only:

false