Record details

Title
    Der Gebirgsschlag vom 13. März 1989 bei Völkershausen in Thüringen im Kalibergbaugebiet des Werratals - Makroseismische Beobachtungen und Analysen
Statement of responsibility
    Günter Leydecker, Gottfried Grünthal, Ludwig Ahorner
Other titles
    Macroseismic Observations and Analysis of the Rock Burst near Vöklershausen on March 13, 1989 in the Werra Potash Mining District of Thuringia
Author
    Ahorner, Ludwig
    Grünthal, Gottfried
    Leydecker, Günter
Language
    německy
Source title - serial
    Geologisches Jahrbuch. Reihe E
Vol./nr.
    Jg. 55
Year
    1998
Notes
    3 obr., 1 diagr., 5 tab., 16 bibl.
    Anglické resumé
    Zkr. název ser.: Geol. Jb., R. E (Hannover).
Subject group
    důl
    důlní otřes
    mapa izoseizmická
    riziko seizmické
    seizmická stanice
    soli draselné
    šíření vln
    zemětřesení
Geographical name
    ČR-Čechy
    Evropa střední
    SRN
Keyword
    13
    1989
    Analysen
    Beobachtungen
    Gebirgsschlag
    Kalibergbaugebiet
    Makroseismische
    März
    Thüringen
    Völkershausen
    Werratals
Abstract (in english)
   The rock burst near Völkershausen on March 13, 1989, in the Werra potash mining area of Thuringia in central Germany was the strongest that has ever occurred as a result of mining activity. Nearly 6.8 km2 of the mine field at a depth of 830 m was destroyed, 3200 carnallititic rock pillars were involved in the rock burst. Subsidence at the surface amounted to a maximum of 81 cm after 18 hours, with an additional 5 cm the next two weeks. The effects at the surface were disastrous. Nearly 80% of the buildings in Völkershausen, a small village situated directly over the rock-burst field, suffered damage. This corresponds to an intensity of VIII-IX on the MSK scale at the epicenter. The damage decreased rapidly with increasing distance from the epicenter, indicationg a shallow seismic source. The vibrations were felt a considerable distance away, especially in the upper floors of tall buildings.
   Macroseismic maps of the near and far fields were drawn on the basis of questionnaires and other information. A theoretical epicentral intensity, depth of focus and absorption coefficient were computed in an iterative procedure using KÖVESLIGETHY's formula on the basis of the radii of the isoseismals. The theoretical and observed intensity at the epicenter correspond very well. But the computed focal depth of 1400 m is deeper than the known depth of the mine galleries that collapsed. This can be explained by the shallow depth and wide area of the focus, which differs considerably from the point source assumed in Kövesligethy's formula. But without a doubth the observed damage and the wide area in which the earthquake was felt can be attributed solely to the collapse of the mine at a depth of 830 m
Contributor
    Česká geologická služba
Contributor code
    ČGS (UNM)
Source format
    U
Entered date
    24. 1. 2008
Import date
    8. 8. 2012