A catalogue of non-tectonic earthquakes in central-eastern Italy

Cattaneo, M.; Caffagni, Enrico; Carannante, Simona; D’Alema, Ezio; Frapiccini, Massimo; Ladina, Chiara; Marzorati, S.; Monachesi, G.

doi:10.4401/ag-6434

Cited by 4 publications

(1 citation statement)

References 16 publications

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“…However, this phenomenon is less obvious in Supplementary Figures S6-S9. Cattaneo et al (2014) believed that studying the frequency of daytime and nighttime seismic events could provide a good reference for determining whether an earthquake is artificial or not. We also drew on this analytical approach.…”

Section: Implication To the Potential Seismic Risk On The Northern Xjfmentioning

confidence: 99%

Seismicity of the repeating earthquake clusters in the northern Xiaojiang fault zone and its implications

Zhou

Xu²,

Wu³

et al. 2022

Front. Earth Sci.

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The Xiaojiang fault zone (XJF), located at the southeastern margin of the Tibetan plateau, has been frequently struck by destructive earthquakes throughout history. Some studies showed that repeating earthquakes may be used to estimate fault slip rates and even to monitor the pre-slip prior to large asperity. This study focuses on the repeating earthquakes recorded by a high-density seismic array in the northern section of the XJF, a segment ruptured by the 1733 Dongchuan M7.8 earthquake. Using the waveform cross-correlation and relocation techniques, we processed the continuous seismic recordings from seismic stations of the array and confirmed 27 clusters of repeating earthquakes. The repeaters are located in three relatively independent sub-areas, areas A, B, and C. Area A is close to the source areas of the 2014 Ludian Ms6.5 and the 2020 Qiaojia Ms5.0 earthquakes; by analyzing the recurrence intervals of repeating clusters, we found that the Ludian earthquake had an insignificant triggering effect on surrounding events, while the triggering effect from the Qiaojia earthquake was obvious. The clusters in area B were located very close to the northernmost tip of the XJF, which should be associated with an asperity preparing for a large earthquake on the northern XJF. Together with a repeating cluster identified in a previous study and the seismicity pattern revealed by our seismic array, we determined the geometry of the asperity and slip rate, which further helps to estimate a potential Mw7.1 earthquake for the asperity, where no M>7 earthquakes have occurred since the 1733 Dongchuan M7.8 earthquake. The clusters in area C are more like human-induced earthquakes because they are concentrated during the daytime when local people are at work, and, thus, they cannot be used for the study of tectonic deformation. This study clearly indicates that the repeating earthquakes can be triggered by a moderate earthquake nearby and also that repeating earthquakes can be used to estimate fault slip rates and outline locked asperities.

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Section: Implication To the Potential Seismic Risk On The Northern Xjfmentioning

confidence: 99%

Seismicity of the repeating earthquake clusters in the northern Xiaojiang fault zone and its implications

Zhou

Xu²,

Wu³

et al. 2022

Front. Earth Sci.

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Man‐induced low‐frequency seismic events in Italy

Latorre

Amato

Cattaneo

et al. 2014

Geophysical Research Letters

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Unconventional seismic events in Italy are detected by scanning three years of continuous waveforms recorded by the Italian National Seismic Network. Cross correlation of signal templates with continuous seismic records has evidenced unusual events with similar low-frequency characteristics in several Italian regions. Spectral analysis and spatiotemporal distribution of these events, some of which are previously interpreted as tectonic long-period transients, suggest that they are not natural, but produced by huge cement factories. Since there are at least 57 full-cycle cement plants operating in Italy, each affecting areas of about 1250 to 2800 km 2 , we argue that significant portions of the Italian territory (23% to 51%) can be affected by this man-made noise. Seismic noise analyses, such as those used for microzonation or crustal structure investigations, as well as data mining techniques used to retrieve anomalous transient signals, should thus take into account this peculiar and pervasive source of seismic waves.

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