GNGTS 2024 - Atti del 42° Convegno Nazionale
Session 2.1 GNGTS 2024 A comparison between moment magnitude scales P. Gasperini 1,2 , B. Lolli 2 1 Dipartimento di Fisica e Astronomia “Augusto Righi”, Università di Bologna, Bologna, Italy 2 Istituto Nazionale di Geofisica e Vulcanologia, Sezione di Bologna, Bologna, Italy Moment magnitude was first defined by Kanamori (1977) and Hanks and Kanamori (1979) in the late 1970s, when the availability of new force balance seismometers made it possible to measure the seismic moment with virtually no limits in the frequency passband. For this 0 reason, does not become saturated even for the largest earthquakes ever recorded. has been chosen in such a way that it coincides best with the previous definitions of magnitude ( , , etc.) on certain ranges of values but can deviate significantly from them within other ranges. A few years ago, a new moment magnitude scale was proposed by Das et al. (2019), with the aim of better reproducing the values of and over their entire range and to better predict the energy radiated by earthquakes. In this work we show that there was no need to define such a new scale and that the latter is not even optimal to achieve the goal that the authors had set themselves. References Das, R., Sharma, M. L., Wason, H. R., Choudhury, D., and Gonzales. G. (2019). A Seismic Moment Magnitude Scale, Bull Seism. Soc. Am., 109/4, 1542–1555, doi: 10.1785/0120180338. Kanamori, H. (1977). The energy release in great earthquakes, J. Geophys. Res. 82, 2981–2987. Hanks, T. C., and H. Kanamori (1979). A moment magnitude scale, J. Geophys. Res. 84, 2348–2350. Corresponding author: paolo.gasperini@unibo.it
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