Microseismic multiplets in the northeastern Bohemian Massif

J 2011

Microseismic multiplets in the northeastern Bohemian Massif

ŠPAČEK, Petr, Pavel ZACHERLE, Zdeňka SÝKOROVÁ and Jana PAZDÍRKOVÁ

Basic information

Original name

Microseismic multiplets in the northeastern Bohemian Massif

Authors

ŠPAČEK, Petr (203 Czech Republic, guarantor, belonging to the institution), Pavel ZACHERLE (203 Czech Republic, belonging to the institution), Zdeňka SÝKOROVÁ (203 Czech Republic, belonging to the institution) and Jana PAZDÍRKOVÁ (203 Czech Republic, belonging to the institution)

Edition

Zeitschrift für Geologische Wissenschaften, 2011, 0303-4534

Other information

Language

English

Type of outcome

Článek v odborném periodiku

Field of Study

10507 Volcanology

Country of publisher

Germany

Confidentiality degree

není předmětem státního či obchodního tajemství

RIV identification code

RIV/00216224:14310/11:00056506

Organization unit

Faculty of Science

Keywords in English

microseismicity; seismic multiplets; correlation; active tectonics; pull-apart; Sudetic Fault System; Bohemian Massif

Abstract

V originále

We have analysed >1800 records of very weak microearthquakes (-1.9<=ML<=2.2) registered in the NE part of the Bohemian Massif during the years 1998-2008. Cross-correlation analysis showed that 74% of these events are duplets and multiplets or near-multiplets. 191 families of these similar events were distinguished, representing small-volume repeatedly activated focal domains. The families are largely variable in terms of number of events (2-101), overall durations of activity (up to >12 years) and time distributions of the events. The magnitude-distribution of events from individual re-activated foci obeys Gutenberg-Richter law at least in the magnitude range -1.3<=ML&<=1.3. The typical b-values are close to b=1, which also applies for the whole catalogue of events located in the region. In this respect, the investigated region is similar to other presently deformed regions where seismicity is controlled by far-field stresses. Based on the fault geometry, the evolution of sedimentary basin in the most active part of the region, and the spatial co-incidence of the earthquake epicentres with carbonated mineral springs in a rhomb-shaped domain, we suggest a preliminary model explaining the studied region as a transfer zone with releasing geometry (pull-apart mechanism), operating within the system of dextral wrench faults.

Citovat

ŠPAČEK, Petr, Pavel ZACHERLE, Zdeňka SÝKOROVÁ and Jana PAZDÍRKOVÁ. Microseismic multiplets in the northeastern Bohemian Massif. Zeitschrift für Geologische Wissenschaften. 2011, vol. 39, 5/6, p. 367-386. ISSN 0303-4534.

@article{977075,
   author = {Špaček, Petr and Zacherle, Pavel and Sýkorová, Zdeňka and Pazdírková, Jana},
   article_number = {5/6},
   keywords = {microseismicity; seismic multiplets; correlation; active tectonics; pull-apart; Sudetic Fault System; Bohemian Massif},
   language = {eng},
   issn = {0303-4534},
   journal = {Zeitschrift für Geologische Wissenschaften},
   title = {Microseismic multiplets in the northeastern Bohemian Massif},
   volume = {39},
   year = {2011}
}

TY  - JOUR
ID  - 977075
AU  - Špaček, Petr - Zacherle, Pavel - Sýkorová, Zdeňka - Pazdírková, Jana
PY  - 2011
TI  - Microseismic multiplets in the northeastern Bohemian Massif
JF  - Zeitschrift für Geologische Wissenschaften
VL  - 39
IS  - 5/6
SP  - 367-386
EP  - 367-386
SN  - 03034534
KW  - microseismicity
KW  - seismic multiplets
KW  - correlation
KW  - active tectonics
KW  - pull-apart
KW  - Sudetic Fault System
KW  - Bohemian Massif
N2  - We have analysed >1800 records of very weak microearthquakes (-1.9<=ML<=2.2) registered in the NE part of the Bohemian Massif during the years 1998-2008. Cross-correlation analysis showed that 74% of these events are duplets and multiplets or near-multiplets. 191 families of these similar events were distinguished, representing small-volume repeatedly activated focal domains. The families are largely variable in terms of number of events (2-101), overall durations of activity (up to >12 years) and time distributions of the events. The magnitude-distribution of events from individual re-activated foci obeys Gutenberg-Richter law at least in the magnitude range -1.3<=ML&<=1.3. The typical b-values are close to b=1, which also applies for the whole catalogue of events located in the region. In this respect, the investigated region is similar to other presently deformed regions where seismicity is controlled by far-field stresses. Based on the fault geometry, the evolution of sedimentary basin in the most active part of the region, and the spatial co-incidence of the earthquake epicentres with carbonated mineral springs in a rhomb-shaped domain, we suggest a preliminary model explaining the studied region as a transfer zone with releasing geometry (pull-apart mechanism), operating within the system of dextral wrench faults.
ER  -

ŠPAČEK, Petr, Pavel ZACHERLE, Zdeňka SÝKOROVÁ and Jana PAZDÍRKOVÁ. Microseismic multiplets in the northeastern Bohemian Massif. \textit{Zeitschrift für Geologische Wissenschaften}. 2011, vol.~39, 5/6, p.~367-386. ISSN~0303-4534.

Detailed Information on Publication Record