CAPjoint, a computer software package for joint inversion of moderate earthquake source parameters with local and teleseismic waveforms

• Autores: Weiwen Chen, Sidao Ni, Hiroo Kanamori, Shengji Wei, Zhe Jia, Lupei Zhu
• Localización: Seismological Research Letters, ISSN 0895-0695, ISSN-e 1938-2057, Vol. 86, Nº. 2 (A), 2015, págs. 432-441
• Idioma: inglés
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• Resumen

  • Accurate earthquake source parameters such as fault mechanism, depth, and moment magnitude are not only important in seismic-hazard assessment, but also are crucial to studies of earthquake rupture processes and seismotectonics. Although large earthquakes (Mw 7+) may cause substantial damage, they occur less frequently. In contrast, moderate earthquakes (Mw 5.0-6.5) occur with much higher frequency and may occur on faults not geologically identified. Some of the moderate earthquakes cause damage in densely populated communities, especially in developing countries (Baumbach et al., 1994; Hamzehloo, 2005). For example, the 2011 Mw 5 earthquake in Lorca, Spain (Pro et al., 2014), the 2012 Mw 5.9 Ferrara earthquake sequence in northern Italy (Malagnini et al., 2012), the 2010 Mw 5 Suining earthquake in Sichuang Province of China (Luo et al., 2011), and the 1998 Mw 5.7 Zhangbei earthquake in Hebei Province of China (Li et al., 2008) all caused substantial economic loss and casualty. Compared with events larger than Mw 7, rupture processes of these moderate events can be approximated as point sources, which are usually described with a centroid moment tensor (CMT) because the rupture duration is usually shorter than the period used in the waveform inversion.

    Many algorithms and software packages have been developed to invert CMT parameters using seismic waveform data. For example, long-period teleseismic waveforms have been routinely used to determine source parameters, such as a W phase solution, Global CMT catalog, and U.S. Geological Survey (USGS) fast moment tensor solutions (Dziewonski et al., 1981; Ekström et al., 2012). However, centroid depth is usually not well resolved in these long-period solutions. Centroid depth estimation is improved with teleseismic body-wave solutions (Chen and Molnar, 1983; Saikia, 2006), which are also routinely reported by National Earthquake Information...