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(Seismology)

Alice-Agnes Gabriel

Department of Earth and Environmental Sciences

Geophysics

Munich University

Theresienstr. 41

80333
Munich

Germany

Room:
416

Phone:
+49 (89) 2180-4214

Fax:
+49 (89) 2180-4205

This semester's class will take place Mondays, 10:15 - 11:45 in C419. Teaching assistants are Dr. Duo Li, Dr. Bo Li and Thomas Ulrich.

- 28.04.2019 Logistics and Introduction
- 06.05.2019 Seismic waves (I) - stress, strain, constitutive equations, seismic wave equation
- 13.05.2019 Seismic waves (II) - Body waves and harmonic plane waves
- 20.05.2019 Seismic waves (III) - Surface waves, dispersion and normal modes
- 26.05.2018 Seismic waves (IV) - Seismic tomography
- 03.06.2019 Seismic waves (V) - Seismic tomography continued
- 17.06.2019 Seismic sources (I) - Quantitative concepts from theory to inverse models
- 24.06.2019 Seismic sources (II) - Earthquake seismology in practice - Real faults and focal mechanisms, radiation patterns and magnitudes

Logistics

Introduction

Background Reading Material: Grand Challenges of Seismology

Homework Help I

Homework Help II

Homework Help III

Lecture slides

Stick-slip animation

Deviatoric stressitis - a virus infecting the Earth Science community

Key formulas for seismology and earthquakes

Exercise 1 - stress and strain

Lecture slides

Guide to install anaconda Python 3.5, obsby, ipython for using jupyter notebooks

Archive containing Jupyter notebook with summary and exercises on the seismic wave equation and plane wave solution - also as .pdf

SAC exercise material

Lecture slides

Archive containing Jupyter notebook with summary and exercises on the surface wave analysis in practice

Introduction into inverse problems, ray theory and traveltime curves, Herglotz-Wiechert Inversion

Jupyter notebook for practical exercises on earthquake location

Exemplary solutions and additional explanations

Reading exercise "Geophysical inversion versus machine learning in inverse problems"

Lecture slides:Seismic phases in a spherical Earth, 1D and 3D Earth models from seismic tomography

Lecture slides

Hand-out: Derivation of the representation theorem

Exercise: Static Displacements on Finite Faults

Notebook: Interseismic Deformation

Lecture slides

*General information:* This semester's class will take place Thursdays, 12:30 - 14:00 am in C419.

*Lecturers:* Duo Li, Shihao Yuan, Alice Gabriel

*Lecture material*

- Introduction and Logistics

- The dislocation model for fault rupture and its applications in Geophysics

- Geodetic inversion and numerical simulation of slow slip phenomena

- Introduction to Seismic Full Waveform Inversion

- Numerical earthquake modelling - across scales

- Numerical modelling of dynamic rupture

- Computer exercise: Jupyter notebooks for 1D and 2D dynamic rupture modelling; and 3D quasi-static and dynamic modelling with PyLith

- Precomputed dynamic rupture solutions for linear slip-weakening and rate-and-state-friction, homogeneous and heterogeneous/scattering materials (5 GB to download! - you can also access the data in the intranet)

- Full Waveform Inversion Lecture II: Gradient calculation using the adjoint-state method

- Full Waveform Inversion Lecture III: Workflow, Applications and Challenges

- Full Waveform Inversion Computer Exercise Material

*General information:* This semester's class will take place Monday, July 16 to Friday, July 20 , 09:00 - 17:00 am in C419 (Mo-Thu) and at the Observatory in Fürstenfeldbruck (Fri). First lecture will take place Monday at 09:30 in C419.

*Lecturers:* Alice Gabriel, Tobias Megies, Stephanie Wollherr, Sebastian Anger

*Literature:*

- Gubbins - Time series analysis
- Claerbout - Fourier transform and waves
- Claerbout - Fundamentals of geophysical data processing

*Preparation:*
For the practicals it is best if you can bring your laptop to class. You can work together, so it's enough if at least half of the students bring their laptop. To prepare, please install the Python 3 version of
Anaconda - available here Anaconda download.
Please also install the latest version of obspy, available here: Obspy installation via Anaconda.
For more detailed instructions on installation you can see below pdf.
Please make sure that you can run Jupyter, and in the browser can start
a new Jupyter Notebook and import obspy in it (see last page of pdf for
details). If you have problems with the installation please contact us
immediately.

*Lecture material*

Monday

- Lecture 1: Introduction and Logistics

- Lecture 2: Data types, centres and formats

- Notebook 1 - Python and ObsPy Introduction

- Notebook 3a - Mathematical Basics 1: Vectors and Matrices, Vector Norms, Matrix Inversion, Determinants, Eigenvectors

- Notebook 3b- Mathematical Basics 2: Complex Numbers, Div, Grad, & Curl of a vector field, Delta function, Taylor Series, Fourier Series

Tuesday

- Lecture 4: Fourier series and transformation
- Lecture 5: Spectral Analysis
- Notebook 2: Data types, centres and formats

- Notebook 3c: Mathematical Basics 3

- Notebook 4: Fourier series and transformation

Wednesday

- Lecture 6: Convolution
- Lecture 7: Filter 1
- Lecture 8: Filter 2
- Notebook 5: Spectral analysis
- Notebook 6: Convolution
- Notebook 7: Filter 1

Thursday

- Lecture 9: Spherical harmonics
- Lecture 10: Correlation
- Lecture 11: Seismometry
- Notebook 8: Filters advanced
- Notebook 9: Spherical harmonics
- Notebook 10: Correlation
- Notebook 11: Seismometry

- Notebook 8 - Solutions

- Notebook 9 - Solutions including Mars topography data

- Notebook 10 - Solutions

Friday

- Field trip to Geophysics Observatory - meet at the observatory at 09:30

On Friday July 20, you will visit the observatory in Fürstenfeldbruck. Easiest way to get there is the S-Bahn S4 in the direction of Geltendorf. From the Fürstenfeldbruck train station, it's a nice 20 min. walk to the observatory. You will stay there all day, so bring lunch! You will also need your laptop.

Link to BayernAtlas map with directions

Printed 22. Jul 2019 04:38