Please use this identifier to cite or link to this item: http://hdl.handle.net/2122/12288
Authors: Braun, Thomas* 
Famiani, Daniela* 
Cesca, Simone* 
Title: Constraints on the source mechanism of the damaging seismic event of August 21, 2017, on Ischia island (southern Italy)
Issue Date: May-2018
DOI: 10.1785/0220180082
Keywords: Ischia
earthquake
Full Moment Tensor
collapse
Abstract: On Aug. 21, 2017, a MD4.0 earthquake struck Ischia island, claiming two lives and provoking severe building damages, disproportionate to the moderate magnitude of the event. Hypocenter locations based on arrival times were afflicted by a large uncertainty and the proposed moment tensor solutions resulted inconsistent among themselves. These contradictory observations gave motivation to recalculate earthquake parameters by alternative approaches. P-phase particle motion, the evaluation of the rotated spectra, and ts-tp lead to a hypocentral depth of 2 km, in the same epicentral area as the devastating seismic event that struck Ischia in 1883. The full moment tensor solution reveals non-double couple contributions of 62%—fitting best for a shallower source depth and estimating a higher magnitude of Mw4.2. To fit the first motion polarity mismatch observed at the closest station IOCA we suggest a complex rupture process, where a first shallow normal faulting event activates a subsequent collapse.
Appears in Collections:Conference materials

Files in This Item:
File Description SizeFormat
Poster-SSA2018-Famiani_small.pdf2.28 MBAdobe PDFView/Open
Show full item record

Page view(s)

8
Last Week
0
Last month
checked on May 27, 2019

Download(s)

1
checked on May 27, 2019

Google ScholarTM

Check

Altmetric