We report the simultaneous observation of 1.6– 1.7 mHz pulsations in the ionospheric F-region with the CUTLASS bistatic HF radar and an HF Doppler sounder, on the ground with the IMAGE and SAMNET magnetometer arrays, and in the upstream solar wind. CUTLASS was at the time being operated in a special mode optimized for high resolution studies of ULF waves. A novel use is made of the ground retur...

required. These basic properties of the soil can then be evaluated to assess the acoustic imaging tradeoffs for The potential application of this work is the detection and imaging detecting and characterizing buried artifacts. The acousof buried objects using acoustic methodology. To image buried artifacts, it is vital to know speed and attenuation of sound in the particular tic attenuation coe...

[1] Nonlinear wave‐wave interactions generate double‐ frequency (DF) microseisms, which include both surface waves (mainly Rayleigh‐type) and compressional (P) waves. Although it is unclear whether DF surface waves generated in deep oceans are observed on land, we show that beamforming of land‐based seismic array data allows detection of DF P waves generated by ocean waves from Super Typhoon Io...

[1] Among the different types of waves embedded in seismic noise, body waves present appealing properties but are still challenging to extract. Here we first validate recent improvements in numerical modeling of microseismic compressional (P) body waves and then show how this tool allows fast detection and location of their sources. We compute sources at ~0.2 Hz within typical P teleseismic dis...

The interpretation of simultaneous ionospheric Doppler sounding and ground magnetometer observations of low-latitude Pi2 waves is revised. We compare the theoretical estimates of the ionospheric Doppler velocity for the same amplitude of the ground magnetic disturbances produced by a large-scale compressional mode and an Alfvén mode. The plasma vertical displacement caused by the wave electric ...

Ž . The complete set of elastic stiffness coefficients of a single crystal of Mg SiO in the modified spinel wadsleyite 2 4 Ž . structure are reported at eight pressures from ambient to 14 Gigapascals GPa . All moduli vary linearly with pressure within Ž . the resolution of the data. Third-order Birch–Murnaghan equation fits to aggregate elastic moduli yield values of 170 "2 Ž . Ž . Ž . GPa and ...

The purpose of this work is to present and analyze the results of numerical simulations related to the application of three different mathematical models in the acoustic seismic wave propagation in which only compressional waves (P-waves) are contemplated. And present the results of an investigation about how these wave equation implementations can influence the amplitudes of a migrated section...

8 Nonlinear wave-wave interactions generate double-frequency (DF) microseisms, 9 which include both surface waves (mainly Rayleigh-type) and compressional (P) waves. 10 Although it is unclear whether DF surface waves generated in deep oceans are observed 11 on land, we show that DF P waves generated under Super Typhoon Ioke far offshore are 12 detected by beamforming of land-based seismic array...