Resumen de Comparing direct observation of strain, rotation, and displacement with array estimates at Piñon Flat Observatory, California
Stefanie Donner, Chin-Jen Lin, Céline Hadziioannou, André Gebauer, Frank L. Vernon, Duncan Carr Agnew, Heiner Igel, Joachim Wassermann, K. U. Schreiber
The unique instrument setting at the Piñon Flat Observatory in California isused to simultaneouslymeasure10out of the 12 components, completely describing the seismic-wave field. We compare the direct measurements of rotation and strain for the 13 September 2015 Mw 6.7 Gulf of California earthquake with array-derived observations using this configurationfor thefirst 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 arraybased measurement, we derived a relation to estimate the frequency range withinwhich the array-derived observationsprovide 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
