Full waveform inversion (FWI) is beginning to be used characterize weak seismic events at different scales, an example of which microseismic event (MSE) characterization. However, FWI with unknown sources a severely underdetermined optimization problem, and hence requires strong prior information about the and/or velocity model. The frequency-domain wavefield reconstruction method (WRI) has sho...

Forest fires are of critical importance in the Mediterranean region. Fire weather indices meteorological that produce information about impact as well characteristics a fire event an ecosystem and have been developed for reason. This study explores spatiotemporal patterns FWI system within area defined by boundaries Greek state. The has calculated studied current future periods using data from ...

Due to climate change and associated longer more frequent droughts, the risk of forest fires increases. To address this, Institute Meteorology Water Management implemented a system for forecasting fire weather in Poland. The Fire Weather Index (FWI) system, developed Canada, has been adapted work with meteorological fields derived from high-resolution (2.5 km) Research Forecasting (WRF) model. ...

Abstract The density structure of firn has implications for hydrological and climate modelling, ice-shelf stability. can be evaluated from depth models seismic velocity, widely obtained with Herglotz–Wiechert inversion (HWI), an approach that considers the slowness refracted arrivals. However, HWI is strictly appropriate only steady-state profiles accuracy compromised where contains ice layers....

The Fire Weather Index (FWI) is used to assess meteorological fire danger worldwide. It has been argued that it lacks an atmospheric instability term. A new enhanced FWI (FWIe) was recently developed incorporating in the form of Continuous Haines (CHI). Here, first climatological and evolution analysis these indexes performed using ERA5 data for 1980–2020 period. There a prevalence higher value...

Full waveform inversion (FWI) is a nonlinear PDE constrained optimization problem, which seeks to estimate constitutive parameters of medium such as phase velocity, density, and anisotropy, by fitting waveforms. Attenuation an additional parameter that needs be taken into account in viscous media exploit the full potential FWI. more easily implemented frequency domain using complex-valued veloc...

As a tropical country, Indonesia is situated in Southeast Asia nation has vast forests. Forest fire occur busy vary due to land conditions and forest drought season. The indicator used mitigated potential study the behavior of weather index (FWI). data gathered from observation station north Sumatra province, computation estimation FWI by Canadian Fire Weather Index based on gathered. It found ...

Full-waveform inversion (FWI) is a technique that has the potential for building high-resolution elastic velocity models. We apply this to wireline monopole acoustic logging data image near-wellbore formation structures, which can be used in fluid intrusion evaluation. Our FWI workflow established cylindrical coordinates instead of Cartesian adapt borehole geometry. Assuming tool centralized an...