Abstract We describe the flexible multimethod seismic site characterization technique for obtaining shear-wave velocity ( V S ) profiles and derivative information, such as time-averaged of upper 30 m S30 ). Simply stated, approach relies on application multiple independent noninvasive acquisition analysis techniques utilized in a field-based through decision process based primary factors inves...

Abstract. During September 2019 a minor sudden stratospheric warming took place over the Southern Hemisphere (SH), bringing disruption to usually stable winter vortex. The mesospheric winds reversed and temperatures in stratosphere rose by 50 K. Whilst warmings (SSWs) SH are rare, with only major SSW having occurred 2002, Northern experiences about six per decade. Amplification of atmospheric w...

A common problem in down-hole shear wave surveys is the determination of the tool rotation relative to the seismic source polarization direction. This paper reports an algorithm which has been developed to solve for this angle in the horizontal plane. The method employs Principal Component Analysis (PCA) to determine the angle from the large motion of the SH-wave (not first motion). Once the an...

The effective response of a periodic fibre reinforced material to SH wave propagation is studied using the method of asymptotic homogenization, complex variable theory and multipole expansions. The quasi-static limit of the effective properties is calculated when the wavelength is much longer than the defining lengthscale of the microstructure. The method developed allows the determination of t...

The effect of transition regions between continental and oceanic structures on the propagation of L, waves from continental sources is examined. In particular, the attenuation due to variations in layer thickness in such transition regions is calculated and explained for a suite of simple models. The measured attenuation, due tq the geometry of the transition regions between the oceanic and con...

40 : 40 : 20, respectively. Factor T was purified by eluting with acetonitrile water 60 : 40. The purified antibiotics precipitated from the elutes after elimination of the acetonitrile under vacuum.GE2270factors were obtained as white powders showing HPLCretention times and molecular weights reported in Table 1. Factor T showed UV spectra with ^MCl 250, 280 (sh), 345 (sh); ^maxN KOH 240 (sh), ...

Abstract. According to Modern-Era Retrospective Research Analysis for and Applications (MERRA-2) temperature wind datasets in 2019, this study presents the global variations eastward-propagating wavenumber 1 (E1), 2 (E2), 3 (E3) 4 (E4) planetary waves (PWs) their diagnostic results polar middle atmosphere. We clearly demonstrate eastward wave modes exist during winter periods with westward back...