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Tidal Coulomb Failure Stresses in the Northern Andean intermediate depth seismic clusters and its implications for a possible correlation between tides and seismicity | | Gloria A. Moncayo
; Gaspar Monsalve
; Jorge I. Zuluaga
; | | Date: |
26 Nov 2018 | | Abstract: | A recent statistical analysis of the relationship between tides and seismic
activity in Colombia has suggested the existence of correlation anomalies for
the case intermediate depth events in the Bucaramanga nest and the Cauca
cluster (Moncayo et al., 2018). In this work, we explore in detail the
hypothesis that tides may be triggering seismic activity in these regions and
extend the analysis to two other seismic clusters in the northern part of South
America, specifically in the areas of Puyo (Ecuador) and Pucallpa (Peru). For
this purpose, we use the available focal mechanism information for almost
hundred events in the area, and calculate for each event the Tidal Coulomb
Failure Stress (TCFS) as obtained from estimations of the tidal strain tensor.
Tidal strains are computed considering both, the Earth Body Tides (BT) and the
effect of the Ocean Tidal Loading (OTL). Since our purpose is to elucidate the
role of tides in earthquake nucleation, calculations of the TCFS are made not
only for the time of earthquake, but also for the time of the closest maximum
strain within a window of a few hours before the events. Our results tend to
support the hypothesis that tidal stresses are contributing to earthquake
generation in all the studied areas. Additional tests on the earthquakes within
the Bucaramanga nest indicate that the monthly phase is the main tidal
contributor to the earthquake generation process. Our results are in agreement
with the suggestion that in the zones of seismic clusters, and given their
intermediate depth conditions where compressional stresses are expected
(Turcotte and Schubert, 2002), the lunisolar forces may contribute to
facilitate the displacement of blocks, and hence the triggering of seismic
activity. | | Source: | arXiv, 1812.1104 | | Services: | Forum | Review | PDF | Favorites | |
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