PPT-Seismic Wave Travel-Time Curves

Danny Hertel EPS 109 Prof Militzer BackgroundMethod As seismic waves travel through different mediums in the earth the different mediums create different wave velocities With geophones the amplitude of the wave response can be measured at the surface and overlaid to create traveltime curves that tell whats underneath. Hubenthal. IRIS Consortium. Beyond the slinky. : Sequencing activities, earthquake visualizations, and demonstrations to enhance student learning of seismic waves. Let’s Compare. Wave fronts to ray paths – . seismic interpretation of . the Marcellus shale . (Bradford County, Pennsylvania). Mouna Gargouri. University of Houston . Department . of . Earth and Atmospheric . Sciences. Allied Geophysical Lab. Advisor: . of the . Moment Tensor. :. M. ij . = M. ji. Now assume the earthquake is a pure double couple, that means there is . no net volume. change, which means . trace must be 0. .. M11 + M22 + M33 = 0. That means independent elements can be represented by 5 independent parameters: . – . Earthquake P-wave & S-wave Travel Time Chart Tutorial. Example 1. : . How long does it take a P-wave to travel 4,000 km? . 1) If . you are asked the . travel time. of a P-wave or S-wave for a given epicenter distance:. Seismology: the study of earthquakes. Seismic waves: terminology, classification, the transfer of energy, how waves move. Measuring earthquakes. Layers of the Earth and seismic waves. What information a seismologist is able to interpret from a seismogram. Introduction to Seismology. 29 Mar 2017. © A.R. Lowry . 2017. Read for . Fri 29 Mar: . S&W. . 119-157 . (. §3.1–3.3). Last time: . Finished Up Normal Modes. • Normal modes have potentially infinite numbers of frequencies. Seismic . Waves. . are shock . waves . given off by earthquakes. . There are 2 types:. 1. . Body Waves. . originate from the . focus. (. F. ). travel . through. . the earth. . They’re used to locate . Earthquake Mechanisms. Brittle Mechanical Model: “stick-slip”. Focal point: 3D point inside the lithosphere where the seismic event occurs. Epicenter: projection of focal point to the map surface . Example 1. : . How long does it take a P-wave to travel 4,000 km? . 1) If . you are asked the . travel time. of a P-wave or S-wave for a given epicenter distance:. a) Go . to the epicenter . distance . This Week’s Lab:. • . How to pick a seismic phase arrival time. • . Introduction to the Burger et al. programs,. . Reflect. . &. . Refract. . Due . 30 Jan . What is the difference between the epicenter of an earthquake and the focus of an earthquake?. List processes involved in plate tectonics. Convection currents in the mantle (. temperature and density differences) . PSTE 4223 . Methodes. . sismiques. 2 x 3h. Overview. Introduction – historical outline. Chapter 1: Fundamental concepts. Chapter 2: Data acquisition and material. Chapter 3: Data interpretation. . Part 1. Seismic Waves and Interior of the Earth. The behaviour of seismic waves in the different layers of the earth provides the most authentic evidence about the composition and structure of the earth. The different types of waves, generated during the occurrence of an earthquake, are generally divided into three broad categories: . Seismic waves: terminology, classification, the transfer of energy, how waves move. Measuring earthquakes. Layers of the Earth and seismic waves. What information a seismologist is able to interpret from a seismogram.