These NNW-SSE primary faults are compartmentalized by two secondary fault orientations observed regionally (WNW-ESE & WSW-ENE), the most notable of which is the ENE-striking Grisham fault zone. Deformation is dominated by NNW-SSE-striking high-angle reverse faults. Faults were classified according to morphology (orientation, length, offset) and mapping confidence (high and moderate) (Fig. (2a) Basement-Rooted FaultsĪ new interpretation of >650 basement-rooted faults was generated to better understand the subsurface architecture of the Delaware Basin and surrounding structural flanks. Figure and caption taken from Horne et al. Earthquake relative relocations from Li and Savvaidis (2021), hypocentral locations are sized by magnitude and colored by depth of relocated event. Shallow faults are publicly available as GIS Shapefiles within the Texas Data Repository and can be accessed through the Digital Object Identifier (DOI) system with DOI: 10.18738/T8/UHWLDRĭB1: Map of the central Delaware basin showing newly mapped shallow fault interpretations and basement-rooted fault traces from Horne et al. The updated shapefile will be denoted by iteration and date (V#). We also provide an update of this interpretation periodically, as more data becomes available to the interpreters. With this work peer-reviewed and published, we maintain the original interpretation (V1) in this data repository. DB1).īasement-rooted faults are publicly available as GIS Shapefiles within the Texas Data Repository and can be accessed through the Digital Object Identifier (DOI) system with DOI: 10.18738/T8/UHOUX8. These fault systems include a contractional, basement-rooted fault system and a shallow, extensional fault system (Fig. Notably, these events have made way for the development of two distinct levels of faulting in the central region of the basin where most earthquakes have been measured. These events have generated a complex network of regional faults. Each subsequent event was influenced by the accumulated tectonic fabric through fault reactivation and strain transfer. This region also has a complex tectonic history, involving several periods of convergence and divergence since the Proterozoic. Many of these events have been linked to oilfield operations such as hydraulic fracturing and wastewater disposal at multiple subsurface levels, however, the identification and characterization of earthquake-hosting faults has remained elusive. There have been >130 Mw +3.0 earthquakes between 2017-2021. The Delaware Basin of Texas and New Mexico is experiencing elevated levels of seismicity.
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