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| Titel: |
Stress-field constraints from recent intraplate seismicity in southeastern Australia |
| Auteur: |
Allen, TI Gibson, G. Cull, JP |
| Verschenen in: |
Australian journal of earth sciences |
| Paginering: | Jaargang 52 (2005) nr. 2 pagina's 217-230 |
| Jaar: |
2005-04 |
| Inhoud: |
Well-constrained fault-plane solutions are determined for five recent moderate-magnitude intraplate earthquakes recorded in southeastern Australia: Thomson Reservoir, Tatong, Corryong and Boolarra South in Victoria, and Appin in eastern New South Wales. The solutions, determined from analysis of vertical-component first-motions, provide an indication of the maximum horizontal stress influencing contemporary regional deformation. The fault-plane solution for the 1996 ML 5.0 Thomson Reservoir earthquake indicates reverse faulting with northwest - southeast-trending horizontal compression. The Yallourn Fault is the most likely source for this event given the orientation of the fault-plane solution and the hypocentral location of the earthquake. The 1997 ML 4.2 Tatong earthquake also indicates reverse faulting with approximate north - south compression. The 1998 ML 4.7 Corryong event indicated a strike-slip mechanism with a compressional axis trending northwest - southeast. Despite local complexities identified within the stress field of the Sydney Basin, the fault-plane solution determined for the 1999 ML 4.6 Appin earthquake indicated strike-slip faulting and is consistent with the proposed weak northeast - southwest compressional regime in the region. The 2000 ML 4.7 Boolarra South earthquake indicates a mechanism consistent with reverse faulting with horizontal compression oriented northwest - southeast. Further analysis of horizontal-component seismograms indicated that the earthquake was possibly a result of movement on the Yarragon Fault. A composite focal mechanism was constructed comprising data from the four Victorian earthquakes (which lie in a similar stress province) used in this study. The solution indicated horizontal compression, consistent with reverse faulting, with an overall maximum horizontal stress trending at approximately 325°. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
Details van artikel 7 van 10 gevonden artikelen
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