Please use this identifier to cite or link to this item:
Authors: Chiaraluce, Lauro* 
Amoruso, Antonella* 
Crescentini, Luca* 
Title: Surface temperature and precipitation affecting GPS signals before the 2009 L’Aquila earthquake (Central Italy)
Issue Date: 2017
Series/Report no.: /210 (2017)
DOI: 10.1093/gji/ggx210
Abstract: An Mw 6.1 normal faulting earthquake struck Central Italy in 2009 April, which unfortunately nucleated right below the town of L’Aquila, causing more than 300 casualties and widespread damage. The main shock was preceded by a foreshock sequence lasting ∼6 months. It has been claimed that an analysis of continuous Global Positioning System (GPS) data shows that during the foreshock sequence a 5.9 Mw slow slip event (SSE) occurred along a decollement located beneath the reactivated normal fault system. This hypothesized SSE that started in the middle of 2009 February and lasted for almost two weeks would have eventually loaded the largest foreshock and the main shock. We show that the strain signal that the SSE would have generated at two laser strainmeters operating at about 20 km NE from the SSE source was essentially undetected.We then propose an alternative interpretation for the displacement observed in the GPS data. A transient signal is present in temperature and precipitation timeseries recorded close to the GPS station that has largest signal referred to the SSE, implying that these contaminated the GPS record. This work illustrates how environmental noise may be relevant when investigating small strain signals, showing the importance of having data from weather stations and water level sensors colocated with GPS stations.
Appears in Collections:Papers Published / Papers in press

Files in This Item:
File Description SizeFormat 
51-Amoruso_EtAl_GJI_2017.pdf6.17 MBAdobe PDFView/Open
Show full item record

Page view(s)

Last Week
Last month
checked on Nov 17, 2018


checked on Nov 17, 2018

Google ScholarTM