Page 215 - Whole Earth Geophysics An Introductory Textbook For Geologists And Geophysicists

197 waves, so components. Love given a followed might station (dilatation) character- shows seis- at and first have California pattern

Earthquakes % south-southeast arrivals of waves. Rayleigh east-west between In focus. (compression), wave the a at Earth downward motions) 7.14a Fig. reverse fault. The upward, 2 would in Fault the in stations

of Interference of Love and Rayleigh Interference of Love and Rayleigh to Rayleigh) than and interference the from direction, the from or (first earthquake. a station stations 7.14b. Andreas seismic
Characteristics =P Only Rayleigh an earthquake located three seismometers, responding = Love, R faster slightly north-south to due outward front in another In out coming (compression) dilatations the from radiating at downward, three the Fig in shown San the by

R) R «<i from = (L surface travel the complex, radiate material (dilatation). P-waves and produced move at recorded pattern along recorded
= (L, S \ 4 1 ' 1 ' 1 on upward that dilatations be
Zz paths of the waves more compress would
z shear) and P-waves first compressions initially occurring
wave initially is either radiation
j.__ Love first material movement and fault)
Ff 7 from each S = appear pattern occurs, move would Seismograms the
First Motion Up—~ First Motion North~_ First Motion West Body and surface compressional, (Fig. 7.12b). waves wave Mechanisms might the of compress. The ground initial of fault of compressions | with earthquake

Vertical (Z) Component North-South Component East-West Component 7.12 body (P only later Rayleigh Focal an the stretching apart and make The nature the pattern at 3 A
& (N) (E) a) of a station. b) Seismograms = wave Love surface waves. earthquake wave then the pattern of station downward. consistent shallow (a right-lateral, strike-slip

& b FIGURE the Rayleigh that The and Earthquake When direction, by stretch thus (Fig. 7.13). izes the mograph station motions

:
“ : ; ; may 4

surface seis- as from the earthquake three the response of out the of the pushed a from waves the is

motion ata Figs. 3.8, 3.12). wave. compressional and body of differently respond waves by taken an For for (seismograms) initial The 7.12. came P-wave the motions First compression come have must Love for Z-component the

three orthogonal components of ground body waves (see also horizontal shear wave; P = motions particle the seismometers paths different the motions. particle different recordings in illustrated Fig. revealing upward, that the upward. ground show the that therefore wave the Z-component) (no motion on appearing

Seismology particle motions for surface and = of view simplified three 3. The to due station, the as well station, the of patterns the is Z-component pushing components E-W westward; than up-down no wave surface of

Earthquake Seismographs measuring the Simplified vertical shear wave; SH = shows a Chapter in arrive the at as station, south-southeast show would the on compression, a as and N-S the northward is there that type only the

Chapter 7 7.10 seismic station. 7.11 FIGURE shear wave; SV 7.11 Fig. explained waves waves mic the to focus occurring seismometers motion) (first ground the on P-wave more ground direction. SSE Notice 3.12); (Fig.

196 FIGURE = S