Determination of Local Magnitude for Earthquakes Recorded from the Texas Seismological Network (TexNet)

• DOI: 10.1785/0220190366
• Publication Date: 2020-11-04T18:00:06Z
• Authors: Florentia Kavoura; Alexandros Savvaidis; Ellen Rathje
• Keywords: Earthquake magnitude

Abstract In this study, we present a local magnitude (ML) relation for the earthquakes recorded from Texas Seismological Network (TexNet) between dates of 1 January 2017 and 31 July 2019. Using comprehensive seismic dataset in Texas, propose distance correction term −logA0, which is consistent with original definition Richter magnitude. The proposed calculation TexNet events accounts attenuation characteristics direct refracted waves over different ranges. Regression analysis Wood–Anderson amplitudes results following trilinear function, represents attributes under investigation: −logA0={2.07×log(Rhyp)+0.0002×(Rhyp−100)−0.72Rhyp≤16 km1.54×log(Rhyp)+0.0002×(Rhyp−100)−0.0816 km<Rhyp≤105 km,0.29×log(Rhyp)+0.0002×(Rhyp−100)+2.45Rhyp>105 km Rhyp hypocentral (km). derived relationship an accurate ML that unbiased 200 range. Compared other relations, study gives lower values all distances than those calculated by (1958), Hutton Boore (1987), Babaie Mahani Kao (2019), Quinones et al. (2019) average 0.01, 0.12, 0.16, 0.15 units, respectively; study’s higher Scales (2017), Yenier Greig (2018) 0.28, 0.08 respectively.