We present a case study of liquefaction triggering analysis performed in the Nakdong-river delta region, based on shear wave velocities obtained by Microtremor Array Method and ground motions generated broadband hybrid motion simulation. Assuming M<sub>w</sub>6.2 earthquake occuring at Dongrae fault, studied sites exceeded design spectra provided Korean Design Standard many exhibite...

Abstract To estimate the phase velocity using array observations of microtremors, some algorithms for estimation include constraints on shape, such as equilateral triangles or placement receivers a circle, in order to reduce error velocity. In present study, direct technique is introduced records obtained through an with arbitrary shape based complex coherency function (CCF), where CCF defined ...

Microtremor is ambient vibration on the surface ground by natural phenomena, human activities, etc. data can be processed using various software such as Geopsy, easyHVSR, and MATLAB. Another alternative to process microtremor Scilab. This research was conducted classify soil HVSR methods Scilab 6.1.0. in Sendangmulyo, Semarang. Data processing includes generating synthetic signals, coding Scila...

Article history: Received 4 July 2015 Received in revised form 4 December 2015 Accepted 10 December 2015 Available online 11 December 2015 This paper presents the time history maps of horizontal-to-vertical spectral ratio (HVSR) of 12 long-term microtremor recordings (LTRs) in Northern Mississippi and the coastal area of Gulf of Mexico. These maps show that a stable predominant frequency (f0) v...

BACKGROUND Ocular microtremor (OMT) is a high-frequency tremor of the eyes. It is present in all individuals and is related to brainstem activity. The OMT signal appears as an irregular oscillatory movement with intermittent burst-like components. The clinical interest in OMT has centered on its use in the assessment of the comatose patient, with broad agreement among authors of its prognostic ...

We describe a novel, noninvasive measurement approach for recording a small involuntary tremor of the eye known as ocular microtremor. The method is based on measuring out-of-plane angular displacements of a target by using laser-speckle correlation of images recorded in the Fourier plane of a lens. The system has a dynamic range of 4 to 5000 μrad, resolution of 4 μrad, and a bandwidth of 250 H...

Microtremor has been widely used to determine soil characteristics and dynamics. In this research, particle mo tion analysis was conducted on 15 microtremor data recordings around the surface of Bribin Underground River in Gunungsewu Karst Area. Spectrum as a basis for determining frequency range process . Particle motion only carried out horizontal component signal which is expected provide re...

This paper reports on the unsupervised analysis of seismic signals recorded in Italy, respectively on the Vesuvius volcano, located in Naples, and on the Stromboli volcano, located North of Eastern Sicily. The Vesuvius dataset is composed of earthquakes and false events like thunders, man-made quarry and undersea explosions. The Stromboli dataset consists of explosion-quakes, landslides and vol...