2018/09/13 by Frank Krüger, Galina Kulikova, Angela Landgraf · 1 voice
Earth and Planetary Sciences · #Earthquake Detection and Analysis #High-pressure geophysics and materials #earthquake and tectonic studies
paper · doi:10.1093/gji/ggy377
openalex publication_date 2018/09/13 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/30
Six large magnitude earthquakes in Central Asia which occurred at the end of the 19th century were recorded on early magnetographs in Great Britain. Scalar seismic moment estimates of the 1911 Chon-Kemin, the 1902 Atushi and the 1907 Karatag earthquakes in Central Asia were recently determined by historical seismogram modelling. For those events, we find agreement between moment magnitudes estimated from seismograms and from magnetograms. This supports the assumption of linear scaling of magnetogram amplitudes as function of M0, which we then use to estimate the moment magnitudes for earlier large-magnitude events, that is, the 1885 Belovodskoe, 1887 Verny and 1889 Chilik earthquakes. The magnetometer data imply that the Chilik earthquake had MW7.9, slightly smaller than the Chon-Kemin event with MW8.0. The Verny earthquake, however, for which we estimate MW7.7, is likely larger than listed in catalogues (M7.3). Similarly, we find a larger magnitude MW7.6 (instead of the previous M6.9) for the Belovodskoe earthquake, but this remains uncertain due to measurement imprecision.