Low-Frequency Centroid Moment Tensor Inversion of the 2015 Illapel Earthquake from Superconducting-Gravimeter Data
2016
Abstrakt
After the 2015 Illapel earthquake the radial and spheroidal modes up to 1 mHz were registered by the network of superconducting gravimeters. These data provide unique opportunity to obtain ultralow-frequency estimates of several centroid moment tensor components.
We employ the superconducting-gravimeter records of 60-h lengths and perform the joint inversion for , and centroid moment tensor components from spheroidal modes up to 1 mHz. The component is also obtained from independent inversion of the radial modes and.
Our results are consistent with the published solutions obtained from higher frequency data, suggesting thus negligible slow afterslip phenomenon.