Stress field and kinematics for diffuse microseismicity in a zone of continental transpression, South Island, New Zealand. Issue 4 (1st April 2017)

• Record Type: Journal Article
• Authors: Warren‐Smith, Emily; Lamb, Simon; Stern, Tim A.
• Is Part Of: Journal of geophysical research. Volume 122:Issue 4(2017)
• Page Start: 2798
• Page End: 2811
• Publication Date: 2017-04-01
• Subjects: focal mechanisms -- stress inversion -- Alpine Fault -- seismicity -- tectonics -- New Zealand; Geomagnetism -- Periodicals; Geochemistry -- Periodicals; Geophysics -- Periodicals; Earth sciences -- Periodicals; 551.1
• DOI: 10.1002/2017JB013942
• Languages: English
• ISSNs: 2169-9313

Abstract

Abstract: We analyze shallow (0–20 km) microseismicity adjacent to the Alpine Fault in New Zealand, where there is oblique convergence of the Australian and Pacific plates. Focal mechanisms for 155 earthquakes (June 2012 to October 2013) are inverted to determine the orientation of the stress field. This yields a principal horizontal axis of compression, S Hmax = 114° ± 10°, which cannot be explained in terms of the sum of stress from tectonic loading due to plate convergence, indicated by GPS observations, and gravitational stresses. The azimuth of slip vectors for individual focal mechanisms cluster perpendicular and parallel to the plate convergence vector. These faults, however, strike at ~45° to S Hmax from the stress inversion, suggesting a very low coefficient of friction. The earthquake slip directions may be kinematically controlled, accommodating the plate convergence on a limited set of fractures, similar to the segmentation for neotectonic faulting along the Alpine Fault, which is partitioned into strike‐slip and thrust segments at a 1–10 km scale. We suggest two possible controls on our calculated S Hmax azimuths. First, there may be a slight clockwise bias in the estimates of S Hmax from earthquakes; slip may be occurring on a more limited range of fractures than assumed by the stress inversion method, although this effect is likely to be relatively small (±5°). More importantly, the components of the stress field may be relieved at different timescales during big earthquakes, resulting in a residual stress field that varies significantly (±15°) on timescales of several large earthquakes. Key Points: Stress inversion of focal mechanisms adjacent to the Alpine Fault reveals an average orientation of S Hmax equal to 114° Kinematic analysis of slip vectors reveals that dextral strike‐slip mechanisms are aligned with the plate convergence vector We propose factors contributing to a uniform stress field across the South Island