The KF-NGA technique for the inversion of macroseismic data. Summary of the solutions obtained from the CPTI15 catalogue data.

We present an overview of the inversions performed with the KF method (Pettenati and Sirovich 2003; Sirovich and Pettenati 2004) on some historical earthquakes in the CPTI15 catalogue data domain. This method is based on a kinematic function (KF) that is controlled during the inversion by the Genetic Algorithm with Niching's Variant (NGA) algorithm (Gentile et al. 2004).

Since we are dealing with historical earthquakes, a distinction is first made between instrumental and pre-instrumental earthquakes. For the former between 1900 and 2009 a quantitative assessment is made, for the latter only qualitative assessments can be made. We present statistics to evaluate the magnitude and epicentral coordinates obtained from KF with instrumental data or the parameters of the CPTI15 catalogue. To evaluate the fault plane solutions, we instead used the disorientation angles with the instrumental focal mechanisms (Sirovich et al. 2013). In the case of pre-instrumental earthquakes, the assessments vary from case to case. From the comparison of the results obtained with techniques based on the conversion of strong motion data into intensity, statistical analysis or comparison with the seismotectonic of the area could be made.

References

Gentile, F., F., Pettenati and Sirovich, L.; 2004. Validation of the Automatic Nonlinear Source Inversion of the U. S. Geological Survey Intensities of the Whittier Narrows, 1987 Earthquake. Bull. Seism. Soc. Am., vol.94, No.5, 1737-1747, October 2004, https://doi.org/10.1785/012003157.

Pettenati, F., and Sirovich, L.; 2003. Test of Source-Parameter Inversion of the USGS Intensities of the Whittier Narrows, 1987 earthquake. Bull. Seism. Soc. Am, vol.93, No.1, 47-60, February 2003, https://doi.org/10.1785/0120010113.

Sirovich, L. and. Pettenati, F; 2004. Source Inversion of Intensity patterns of Earthquakes; a Destructive Shock in 1936 in northeast Italy. Journal of Geophysical Research, vol. 109, B10309, 2004, 1-16, https://doi.org/10.1029/2003JB002919.