A simple horizontal pendulum - WOU
Inverted pendulum The mass can swing in all horizontal directions This is the principle of the Wiechert seismograph used in Bergen from 1921 to 1968, see figure below The Wiechert seismograph The mass horizontal motion is captured by two arms that, by using a system of levers, can amplify the motion and record it on two rotating drums (R)
wwwSEISMOGRAPH
SEISMOGRAPH SCALE Tool 24 Accelerogram-Scaling A Comprehensive Tool for Scaling Ground Motions Up to 11 pairs of horizontal records Built-in Code Spectrum: 2800 v4 / ASCE 7 (2010 & 2016) 2 Methods of Scaling + Free Adjustment Tool User-Friendly Design & Workflow
Seismometer Theory - RLL Instruments
1 Horizontal Seismograph Figure 1 Illustration of the deflection of a pendulum in response to a constant horizontal acceleration of the case of the instrument The mass movement (deflection) is in the opposite direction to that of the acceleration Here the direction of the earth's field is shown as the dotted-line vector g
Chapter 8 EARTHQUAKES
A seismograph designed to record horizontal ground motion Seismograph measuring horizontal displacement Seismology Types of seismic waves 1 Surface waves
Strong Ground Motion - Memphis
seismograph is called Acceleration Seismograph or short period seismograph If T of pendulum = T of ground motion and if appropriate damping for the pendulum is chosen, this type of seismograph is called velocity Seismograph Undamped Free Vibration ω= k m f = ω 2π T f == 12π ω Period of Vibration (seconds/cycle) Cyclic Frequency (cycles
Seismic Signatures - manualraspberryshakeorg
As with a book, the right end of any horizontal line “connects” with the left end of the line below it Figure 7B— Helicorder grab from USGS “Real-time Seismograph Displays Each horizontal line represents 15 minutes of data; four lines per hour The colors of the horizontal lines have no particular significance except
A Long-Period Seismograph System
Abslracl--c\ matched three-component seismograph system operating with pendulum period of 30 sec and galvanometer period of 90 sec is described As a result of increased sensi for periods greater than 20 sec, seismograms from these instruments contain information not previously available Iniroduclioll-The advantages of a seismograph
Cascadia’Amphibious’Array’ Ocean&Bottom&Seismograph
1 Cascadia’Amphibious’Array’ Ocean&Bottom&Seismograph& Horizontal*Component*Orientations 2012 2013OBSDeployments Version1 0
Chapitre 2 - AlloSchool
Sismographe vertical Sismographe horizontal • Amplitude : L’amplitude d’une onde sismique dépend de l’énergie transportée Or cette énergie est souvent colossale Elle peut aller de 108 à 1020 J 1111
Physique - Dunod
repère lié au tube Le tube de longueur 2 est dans le plan horizontal et tourne autour de l’axe Oz vertical à la vitesse angulaire ω constante 1 Déterminer l’équation différentielle en r du mouvement de M 2 Calculer le temps τ que mettra M pour sortir du tube avec = 0,1 m; r0 = 0,01 m; v0 = 0 m s−1 et ω = 2rad s−1 3
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