S U M M A R Y Passive seismic methods using earthquakes can be applied for extracting body waves and obtaining information of subsurface structure. In this study, we retrieve direct and reflected plane waves by applying seismic interferometry to the recorded ground motion from a cluster of regional earthquakes. We apply upgoing/downgoing P/S wavefield decomposition, time windowing, and multidim...

Molybdate, tungstate, fluoride, vanadate, and GTP-gamma-S [guanosine-5'-0-(3-thiotriphosphate)] were injected into Limulus ventral photoreceptors by ionophoresis from microelectrodes. All of these drugs induce discrete waves of depolarization similar in waveform to, but smaller in amplitude than, those normally elicited by dim light. As for light-evoked waves, the amplitude of drug-induced wave...

The spectral content of high frequency (1-30Hz) P and S phases observed by ocean bottom seismographs (OBS's) in the Mariana basin is investigated . It is shown that autoregressive models of 10-30th order are suitable for analyzing high frequency waves. For events with S-P times greater than 50 sec, both the predominant frequency and the wave energy of observed P and S phases are confined to a n...

This project implements a method, presented by Longuet-Higgins and Cokelet, for modeling the breaking of ocean waves. Five waves are generated, with the same shaped profile but different amplitudes. Their behavior over time is compared, and it is seen that higher amplitude waves break faster and with a sharper point. Additionally, a variable S is calculated to measure the surfability of these w...

Ultra-low-frequency (ULF) waves have been observed in the Mercury’s magnetosphere. In this work, Mariner-10 and MESSENGER high resolution magnetic field data are studied with wavelet analysis. Two ULF wave intervals have been selected: 29 March 1974 (Mariner-10) and 14 January 2008 (MESSENGER). Non-stationary oscillations, with strong amplitude and narrow bandwidth have been found. The Mariner-...

Passive seismic methods using earthquakes can be applied for extracting body waves and obtaining information of subsurface structure. To analyze earthquake data, one traditionally uses receiver functions, tomography, and seismic interferometry. In this study, we retrieve reflected body waves by applying seismic interferometry to the recorded ground motion from a cluster of earthquakes. We emplo...

We obtain linearized (i.e., non-global) convergence conditions for iterative methods that seek solitary waves with prescribed values of quadratic conserved quantities of multicomponent Hamiltonian nonlinear wave equations. These conditions extend the ones found for single-component solitary waves in a recent publication by J. Yang and the present author. We also show that, and why, these conver...

We retrieve reflected plane waves by applying seismic interferometry to the recorded ground motion from a cluster of earthquakes. We employ upgoing/downgoing P/S wavefield decomposition, time windows, time reversal, and multi-dimensional deconvolution (MDD) to improve the quality of the extraction of reflected waves with seismic interferometry. Because MDD interferometry requires the separation...

The rotation of the Earth leads to a change in the equation of motion because of the Coriolis force. We study how Earth’s rotation affects elastic wave propagation. We show that the Coriolis force does not deflect seismic rays because the medium that carries the waves moves with Earth’s rotation. However, Earth’s rotation causes a weak traverse component of P-waves and a weak longitudinal compo...

a systematic study on the electrochemical behavior of the s-derivatives of 2-amino cyclopentene-1-dithiocarboxylic acid (acda) has been carried out in aqueous ethanolic solutions by means of polarography, coulometry and voltammetry. all the compounds studied exhibited a well defined anodic wave corresponding to a diffusion controlled process. controlled potential coulometry gave n=1 per mole fo...