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Quantification of earthquake diagnostic effects to assess low macroseismic intensities

Author

Listed:
  • Paola Sbarra

    (Istituto Nazionale di Geofisica e Vulcanologia)

  • Patrizia Tosi

    (Istituto Nazionale di Geofisica e Vulcanologia)

  • Valerio Rubeis

    (Istituto Nazionale di Geofisica e Vulcanologia)

  • Diego Sorrentino

    (Istituto Nazionale di Geofisica e Vulcanologia)

Abstract

A large amount of data about earthquake effects, supplied by citizens through a web-based questionnaire, enabled the analysis of the occurrence of many of the effects on humans and objects listed in macroseismic scales descriptions. Regarding the other diagnostic effects (rattling, moving, shifting, falling or overturning depending of the object type of doors, windows, china, glasses, small objects, pictures, vases, books, as well as frightened people and animal behaviour), data from more than 300,000 questionnaires about earthquakes felt in Italy from June 2007 to August 2017, were analysed by stacking them together as a function of hypocentral distance and magnitude. The comparison of the resulting percentages with the intensity prediction equation showed that almost all the chosen effects are good diagnostics for macroseismic intensity evaluation, as their percentages are well differentiated. We did not analyse the oscillations of hanging objects and liquids because the differences in effect attenuations, highlighted by the maps of the occurrence percentage, suggested to not consider them as diagnostic effect. This result allowed us to quantify the occurrence of each diagnostic effect for the intensity degrees from II to VI of the European macroseismic scale for the people who felt the earthquake. The application of the intensity assessment method to internet macroseismic data, based on the specifications herein proposed, should mitigate the problem of “not felt” undersampling in crowdsourced web data.

Suggested Citation

  • Paola Sbarra & Patrizia Tosi & Valerio Rubeis & Diego Sorrentino, 2020. "Quantification of earthquake diagnostic effects to assess low macroseismic intensities," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 104(3), pages 1957-1973, December.
    • Handle: RePEc:spr:nathaz:v:104:y:2020:i:3:d:10.1007_s11069-020-04256-6
    DOI: 10.1007/s11069-020-04256-6
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    1. Paola Sbarra & Patrizia Tosi & Valerio De Rubeis, 2010. "Web-based macroseismic survey in Italy: method validation and results," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 54(2), pages 563-581, August.
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