Gutenberg-Richter Law Parameters Analysis Using the Hellenic Unified Seismic Network Data Through FastBee Technique

Abstract

Abstract:The mapping of the minimum completeness magnitude Mc and parameters (a-and b-value) of the Guttenberg-Richter (G-R) law was studied for Greece territory and adjacent areas by using the new earthquakes catalog produced by the Hellenic Unified Seismological Network (HUSN). For the calculation of the parameters a-and b-values the visual method of the completeness magnitude (Mc) definition was used by means of FastBee technique. The results show that with the commissioning of the new network HUSN, the Mc have significantly decreased and have achieved the value M=1.5 in the central part of Greece and practically up to M=2.0 for the entire territory. Despite the short time of observation (11.2011-05.2014) the statistical reliable pattern of the spatial distribution of the G-R law parameters for territory of Greece was derived. In generally the spatial distributions of a-and b-value reflect the known seismotectonic structures of Greece. The distribution of the relatively low b-value coincides with the tectonic compression field which acts along the Hellenic Trench. The relatively low b-value is also observed on the northern-eastern part of Greece. The relatively high values of b-value meet mainly in the central Greece, where the extensional stress field dominates. The spatial pattern of the parameter a-value is reflecting the seismic activity of the under study region. The results of detailed analysis of b-value distribution with depth in the Corinthian Gulf area show that its values significantly decreased (from 1.6 to 0.76) in depth interval from 1 up to 17 km and then gradually increased up to 30 km. The pattern of b-value in depth distribution in this region was interpreted in the frame of hypothesis about the brittle-ductile transition zone existence. On the basis of this result, it is supposed that detailed study of the b-value distribution versus depth can be used for assessment of the focal depths of the impending strong earthquake. The present results show the applicability and the efficiency of the FastBEE technique for three dimension mapping of Mc and the G-R parameters.

Study of Temporal Analysis onEarthquake Data and Statistical Seismology of Nepal

“…Here, the constant "b" is slope parameter with 0.89 value which indicates this slope is slightly gentler i.e. more productive for the larger aftershock and lies in the expected range of 0.5 to 1.5 globally [10,11].…”

“…The exponential pattern of relationship between frequency and magnitude is observed. The frequency magnitude distribution reflects fundamental properties of how earthquakes grow and stop [11]. The Gutenberg Richter parameters were calculates, by Least Square Method for aftershock data 2015, using the relation as Log10 N (m) = ab M = 6.5 -0.89 M. This Gutenberg-Richter relation expresses the relationship between the magnitude and total number of earthquakes in any given region (Nepal) and time period of at least that magnitude (≥ 4).…”

ANALISIS PARAMETER a-VALUE DAN b-VALUE SEBAGAI MITIGASI BENCANA GEMPA BUMI DI NUSA TENGGARA TIMUR

“…Penelitian ini melibatkan tiga variabel diantaranya variabel bebas adalah besaran momen ( ), variabel kontrol adalah distribusi parameter a-value dan bvalue menurut persamaan Gutenberg-Richter di Nusa Tenggara Timur, serta variabel respon adalah frekuensi kejadian gempa bumi, a-value, b-value, dan dimensi fraktal. Data gempa bumi dan visualisasi waktu kejadian dapat menjadi parameter seismik dengan bantuan software untuk pemetaan (Popandopoulos G. A. & Chatziioannou E., 2014).…”

“…( ) (8) N merupakan frekuensi kejadian gempa bumi, a merupakan konstanta keaktifan seismik, b merupakan konstanta kerapuhan batuan dan M merupakan magnitudo gempa bumi. Pada persamaan 8 menunjukkan persamaan linear, log N adalah variabel respon sumbu Y dan M, variabel bebas sumbu X. Persamaan a-value yaitu perpotongan sumbu Y di sumbu X yang menunjukkan jumlah data gempa dengan luas wilayah, sedangkan b-value yaitu gradien suatu garis hubungan regresi yang menunjukkan hubungan antara jumlah gempa besar maupun gempa kecil (Popandopoulos G. A. & Chatziioannou E., 2014).…”

GIS-Based Mapping of Seismic Parameters for the Pyrenees

“…In seismicity studies, some parameters have a particularly important role. Among others, these are the maximum magnitude (recorded, possible, expected), the b-value of the Gutenberg-Richter (GR) frequency-magnitude (FMD) relation, and a parameter related to the seismic activity (mean seismic activity rate or the a-value of GR) [1][2][3][4][5][6][7][8][9][10][11][12][13]. Some of these studies are based on seismic zonations [1,2], and others are found in a purely geographical grid division [7,11,14,15].…”