Global tomography

We have produced two tomographic models:

1. -SEISGLOB2 based on normal modes, surface waves and body waves (Durand et al., 2017),
   

2. -SEISGLOB1 based on normal modes and surface waves (Durand et al., 2016).
   

We also produce automatically updated azimuthally anisotropic upper mantle models based on Rayleigh surface waves (Durand et al., 2016).

We developed one of the largest Rayleigh surface wave dataset (Durand et al., 2015)

We provide a Python class and a GUI interface, called SeisTomoPy, in order to facilitate the visualization and comparison of our tomographic models with other recent ones (Durand et al., 2018).

Download SEISGLOB1

Download SEISGLOB2

Download the surface wave dataset

Download SEISTOMOPY

Application of micropolar elastic theory to seismology

We first shown that micropolar motions affect ultra-high frequency waves (both travel times and amplitude) and we use this observation to compute Cosserat modulus values for perovskite at the (P,T) conditions in the lower mantle (Abreu et al., 2018a).

Then we applied the micropolar elastic theory to the moment tensor theory and find that it enables to predict anti-symmetric moment tensors that the usual linear elasticity theory cannot model (Abreu et al., 2018b).

Mapping seismic heterogeneities in D”

We have produced a continuous map of the D” layer in the North Atlantic revealing complex features in both P and S properties (Durand et al., 2019).

Download travel time measurements

Seismic attenuation in the Earth’s mantle

1. -Apparent attenuation due to small-scale elastic heterogeneities (Ricard et al., 2014)
   

2. -Differential t* measurements ScS-S and new 1-D Q profile of the Earth’s mantle (Durand et at., 2013)
   

3. -Effect of phase transition on attenuation of seismic waves (Lagrand et al., 2019 ; Perillat et al., 2015 ; Durand et al., 2012)
   

Download 1-D Q model