Topic
Shadow zone
About: Shadow zone is a research topic. Over the lifetime, 614 publications have been published within this topic receiving 14785 citations.
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Papers
Book•
1 Jan 1995
TL;DR: A review of the history of global seismology can be found in this article, where the authors present a survey of the current state of the art in the field of Seismology.
Abstract: Introduction: Historical Development of Global Seismology. The Topics of Global Seismology. Elasticity: Strain. Stress. Equation of Motion. Wave Equations: and S Waves. Body Waves and Ray Theory:The Eikonal Equation and Ray Geometry. Travel Times in a Layered Earth. Travel-Time Curves in a Continuous Media. Travel Times in a Spherical Earth. Wave Amplitude, Energy, and Geometric Spreading. Partitioning of Seismic Energy at a Boundary. Attenuation and Scattering. Surface Waves and Free Oscillations: Free-Surface Interactions. Rayleigh Waves. Love Waves. Dispersion. Tsunamis. Free Oscillations. Attenuation of Surface Waves and Free Oscillations. Seismometry: Inertial Pendulum Systems.Earth Noise. Electromagnetic Instruments and Early Global Networks. Force-Feedback Instruments and Digital Global Networks. Seismic Arrays and Regional Networks. Seismogram Interpretation: Nomenclature. Travel-Time Curves. Locating Earthquakes. Generalized Inverse. Determination of Earth Structure: Earth Structure Inversions. Earth Structure. Seismic Sources: Faulting Sources. Equivalent Body Forces. Elastostatics. Elastodynamics. The Seismic Moment Tensor. Determination of Faulting Orientation. Earthquake Kinematics and Dynamics: The 1-D Haskell Source. The Source Spectrum. Stress Drop, Particle Velocity, and Rupture Velocity. Magnitude Scales. Seismic Energy and Magnitude. Aftershocks and Fault Area. Scaling and Earthquake Self-Similarity. Earthquake Statistics. Seismic Waveform Modeling: Body Waveform Modeling: The Finite Fault. Surface-Wave Modeling for the Seismic Source. The Source Time Function and Fault Slip. Complex Earthquakes. Very Broadband Seismic Source Models.Seismotectonics: Divergent Boundaries. Transcurrent Boundaries. Convergent Boundaries. Intraplate Earthquakes. The Earthquake Cycle. Earthquake Prediction. Subject Index.
1,566 citations
1 Jan 1972
725 citations
TL;DR: In this paper, the authors analyzed the surface topography of the Pacoima Dam accelerogram, based on the semi-cylindrical canyon, for the two-dimensional scattering and diffraction of plane SH waves.
Abstract: The two-dimensional scattering and diffraction of plane SH waves by a semi-cylindrical canyon is analysed for a general angle of wave incidence The closed-form solution of the problem shows that the surface topography can have prominent effects on incident waves only when the wavelengths of incident motion are short compared to the radius of a canyon The surface amplification of displacement amplitudes around and in the canyon changes rapidly from one point to another, but the amplification is always less than 2 The over-all trends of amplification pattern are determined by two principal parameters: (1) γ, the angle of incidence of plane SH waves, and (2) η, the ratio of radius of the canyon to one-half wave length of incident waves The higher η leads to greater complexity of the pattern of surface displacement amplitudes characterized by more abrupt changes of amplification from one point to another, while γ mainly determines the over-all trends of displacement amplitudes For grazing and nearly grazing incidences, for example, a strong shadow zone is developed behind the canyon
The qualitative analysis of the topographic effects on the Pacoima Dam accelerogram,1 based on the semi-cylindrical canyon, suggests that this strong-motion record was not seriously affected by surface topography of the recording site
499 citations
TL;DR: Good agreement is found between strong ground-motion records integrated to displacement and 1-hertz Global Positioning System (GPS) position estimates collected ∼140 kilometers from the earthquake epicenter.
Abstract: The 3 November 2002 moment magnitude 7.9 Denali fault earthquake generated large, permanent surface displacements in Alaska and large-amplitude surface waves throughout western North America. We find good agreement between strong ground-motion records integrated to displacement and 1-hertz Global Positioning System (GPS) position estimates collected ∼140 kilometers from the earthquake epicenter. One-hertz GPS receivers also detected seismic surface waves 750 to 3800 kilometers from the epicenter, whereas these waves saturated many of the seismicinstruments in the same region. High-frequency GPS increases the dynamic range and frequency bandwidth of ground-motion observations, providing another tool for studying earthquake processes.
350 citations
Related Topics (5)
Performance Metrics
| Year | Papers |
|---|---|
| 2023 | 3 |
| 2022 | 3 |
| 2021 | 2 |
| 2020 | 5 |
| 2019 | 5 |
| 2018 | 6 |