Expert-level seismology covering earthquake seismology, seismic wave propagation, seismometer instrumentation, earthquake source parameters, seismic hazard, and induced seismicity.
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P-waves: compressional, fastest, travel through solids and liquids. S-waves: shear, slower, only through solids, larger amplitude. Surface waves: Rayleigh and Love, largest amplitude, most destructive. Wave speeds: Vp = sqrt of (K + 4/3 G) over rho, Vs = sqrt of G over rho.
Fault types: normal, reverse, strike-slip — defined by focal mechanism. Focal mechanism: beach ball diagram showing fault plane and slip direction. Moment magnitude: Mw = 2/3 log10(M0) - 6.05, M0 = seismic moment. Stress drop: difference between initial and final stress on fault — 1-10 MPa typical. Gutenberg-Richter: log10(N) = a - bM, b ~ 1 globally.
PSHA: probabilistic seismic hazard analysis — combines recurrence and attenuation. Ground motion prediction: attenuation relations, site amplification. Return period: 475 years for 10% in 50 years (standard engineering design). Site effects: soft sediments amplify shaking, liquefaction in saturated sands.
Broadband: IRIS/FDSN global network, flat response 0.001-10 Hz. Strong motion: accelerometers for near-field recording, not clipped by large events. Dense arrays: local monitoring, induced seismicity, volcanic tremor. DAS: distributed acoustic sensing, fiber-optic cables as seismic arrays.
| Pitfall | Fix |
|---|---|
| Confusing magnitude scales | Mw is preferred, others saturate for large events |
| Ignoring site amplification | Always apply site correction in hazard analysis |
| Mislabeling focal mechanism planes | Need independent data to identify fault plane |
| Forgetting time zone in phase picking | Always use UTC for seismic data |
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日本語の概要は準備中です。原文の説明を表示しています。