We tackle the problem of characterizing the subsurface, more specifically detecting shallow buried objects, using seismic techniques. This problem is commonly encountered in civil engineering when cavities or pipes have to be identified from the surface in urban areas. Our strategy consists of processing not only first arrivals, but also later ones, and using them both in tomography and migrati...

Extremely small iron oxide nanoparticles (ESIONPs), which have a switchable contrast signal and favorable biocompatibility, are gaining considerable attention as smart magnetic resonance imaging (MRI) agents (CAs). Adaptive MRI CAs could improve the accuracy of tumor diagnosis because they realize rapid conversion under an endogenous stimulus. Herein, based on hydrophilic to hydrophobic transit...

A method for displaying prestack seismic data that highlights azimuthal anisotropy is shown. Observations of azimuthal anisotropy in prestack seismic data using this and other methods make it clear that azimuthal anisotropy is observed in all types of seismic data, land, marine and multicomponent and it is widespread, from the shallowest to the deepest reflectors. Consequently, anisotropy must ...

Citation Zhang, Haijiang et al. " Three-dimensional passive seismic waveform imaging around the SAFOD site, California, using the generalized Radon transform. Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. The MIT Faculty has made this article openly available. Please share how th...

We introduce an operad which acts on the Gerstenhaber-Schack complex of a prestack as defined by Dinh Van and Lowen, in particular allows us to endow this with underlying $L_{\infty}$-structure. make use $\operatorname{Quilt}$ was used Hawkins order solve presheaf case. Due additional difficulty posed presence twists, we have fundamentally different way (even for presheaves) allow extension pre...