Detecting large-scale landslide and earthquake mass transfer using the next generation of gravity missions: simulations and case studies
19/09/2016 | 11:45 | Session 1: Data Processing strategies and new concepts
Author(s): Athina Peidou and Georgia Fotopoulos
Athina Peidou and Georgia Fotopoulos
The main objective of this research was to determine the feasibility of detecting landslides and earthquakes using the next generation gravity missions (NGGMs), including the GRACE Follow-On mission. This was assessed through simulations of case studies involving large-scale mass transfer. The simulations focus on determining the effect of various-scale geohazards on the gravity field at satellite elevation and employ 3-D forward modelling and 2-D wavelet multi-resolution analysis. Case studies include the catchment-scale events such as the Heart Mountain Landslide (50km x 70km) and the Tohoku earthquake triggered submarine landslide (40km x 20km) as well as regional scale events such as the Agulhas slump (750km x 106 km) and the Grand Banks slide (1000km x 25km). The results indicate the resolution (and volume) of mass transfer events that can be detected using the NGGMs specifications (at various satellite altitudes) assuming an inherent noise level for the observations of 30 microgals (including satellite noise and aliasing effects). Overall the studies improve our understanding of mass movement processes by analyzing the gravity signatures of various events using NGGM specifications.