Spatial correlation of ground motions in the 2016-2017 Central Italy seismic sequence

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Schiappapietra, Erika and Douglas, John (2019) Spatial correlation of ground motions in the 2016-2017 Central Italy seismic sequence. In: SECED 2019 Conference, 2019-09-09 - 2019-09-10, University of Greenwich.

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Abstract

Over the past decade, spatial correlation of earthquake ground motion has become increasingly important for seismic hazard and risk assessments, particularly when applied to portfolios of buildings or spatially distributed infrastructures. Indeed, not only do these studies require the estimation of ground motion intensity measures at multiple sites, but also the quantification of the correlation structure. Several spatial correlation models have been published and common findings suggest that intraevent correlation decreases quite rapidly with increasing separation distances. Nevertheless, significant differences among the proposed models exist, leading to large uncertainties in the assessed seismic risk. This suggests that different correlation estimation methods, earthquake type and magnitude, as well as region and local site conditions might play first-order roles in the observed differences. The aim of this study is to identify factors that influence the correlation structure of ground-motion measures and quantify the variability of spatial correlation among different events within the same region and with the same local site conditions. In order to investigate this, we carry out a thorough geostatistical analysis of the intra-event correlation structure, taking advantage of the 2016-2017 Central Italy seismic sequence database, which include nearly 1,600 records from nine Mw ≥ 5.0 events that occurred over a time period of five months. Our preliminary results could be used to improve seismic loss estimation as well as for more informed risk management and decision making in this region.

ORCID iDs

Schiappapietra, Erika ORCID logoORCID: https://orcid.org/0000-0002-4274-3617 and Douglas, John ORCID logoORCID: https://orcid.org/0000-0003-3822-0060;
  • Item type:Conference or Workshop Item(Paper)
    ID code:71498
    Dates:
    Date
    Event
    9 September 2019
    Published
    9 September 2019
    Accepted
    Notes:SECED allows authors to deposit their AAM under the Creative Commons Attribution Non-commercial International Licence 4.0 (CC BY-NC 4.0). The deposit must clearly state that the AAM is deposited under this licence and that any reuse is allowed in accordance with the terms outlined by the licence. To reuse the AAM for commercial purposes, permission must be sought by contacting seced@ice.org.uk
    Subjects:Technology > Engineering (General). Civil engineering (General) > Environmental engineering
    Department:Faculty of Engineering > Civil and Environmental Engineering
    Depositing user: Pure Administrator
    Date deposited:19 Feb 2020 12:15
    Last modified:11 Nov 2024 17:01
    Related URLs:
    URI:https://strathprints.strath.ac.uk/id/eprint/71498
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