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Comparing Direct Observation of Strain, Rotation, and Displacement with Array Estimates at Piñon Flat Observatory, California

ABSTRACT The unique instrument setting at the Pinon Flat Observatory in California is used to simultaneously measure 10 out of the 12 components, completely describing the seismic‐wave field. We compare the direct measurements of rotation and strain for the 13 September 2015 M w  6.7 Gulf of California earthquake with array‐derived observations using this configuration for the first time. In general, we find a very good fit between the observations of the two measurements with cross‐correlation coefficients up to 0.99. These promising results indicate that the direct and array‐derived measurements of rotation and strain are consistent. For the array‐based measurement, we derived a relation to estimate the frequency range within which the array‐derived observations provide reliable results. This relation depends on the phase velocity of the study area and the calibration error, as well as on the size of the array.