Harvard-EPS-55
Harvard EPS-55: An Introduction to Earthquake Seismology
Instructor: Mostafa Mouasvi
Interactive Visualizations
Click on each image to see the live interactive version:
Lecture 1: Eearthquake Impacts
| Earth's Timeline with Human Population Explosion | Earthquake Timeline: Magnitude vs. Human Impact |
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Lecture 2: Geological Faults
| Fault types! | Fault orientations (Strike, Dip, and Rake angles)! | Mohr-Coulomb Failure! |
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Increase principal stresses - try adjusting the sliders so the blue Mohr circle clearly crosses the red failure envelope. Watch the Mohr circle grow until it touches the failure line. You’ll see:
Change material properties - see how stronger materials (higher c, φ) resist failure
Compare different scenarios - weak vs. strong materials under various stress conditions
Understand the physics - why normal stress increases shear resistance
Lecture 6: Earthquake Cycle
| Interseismic/Coseismic Ground Displacement! | Interseismic-Coseismic-Postseismic Phases! | Interactive Spring-Block Earthquake Model! | Interactive Recurrence Models with Rate-and-State Friction! | Rate-and-State Friction Explorer! |
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Lecture 7: Fault Rupture
| Far-Field Apparent Rupture! | Directivity Explorer! | Earthquake Directivity Effects! | Earthquake Nucleation Hypotheses! | Interactive Rupture Dynamics Explorer! |
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| The Haskell Source Model! | Interactive Source Time Function (STF) Explorer! | Earthquake Source Time Function Calculator! |
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Lecture 8: Seismic Waves
| Seismic Waves Speed! | Seismic Waves Simulator! | Seismic Wave Propagation! |
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Lecture 9: Sensors
| Das Basics! | DAS Technology: Fiber Optic Seismic Detection! | GPS and InSAR! |
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Lecture 11: Reading Seismograms
| Seismic Cross-over Distance! | Direct Waves vs Head Waves! | Lg Wave - Crustally Guided Seismic Wave! |
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| Rayleigh Wave Creation and Propagation! | Interactive Seismogram Viewer! | Travel Time Curves & Seismic Phase Identification! |
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Lecture 12: Earthquake Signal Detection
| Amplitude Thresholding Method! | STA/LTA Method! | Cross-Correlation Basics! |
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| Template Matching Method! | Template Matching vs Similarity Search! | FAST Method! |
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| Neural Network Detectors - Basics! | Neural Network Detectors - ! | Method Comparison! |
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Lecture 13: Earthquake Location
| Triangulation Method! | Basics of Inverse Problems! | Gieger Method! | Compare Location Methods! | Relative Relocation! |
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Lecture 14: Magnitude Estimation
| Cumulative Seismic Moment! | Magnitude Saturation! | Interactive Magnitude Scale Comparison! | Earthquake Magnitude Scales Comparison! | Seismic Moment Calculator! |
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| Interactive Magnitude Scale Simulator! |
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Lecture 15: Quake’s Focal Point
| Focal Mechanism | Interactive 3D Fault & Beachball Simulator | Interactive Moment Tensor Decomposer |
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Lecture 16: Seismic Attenuation
| Interactive Coda-Q Simulator! | East-Coast vs West-Coast Attenuation! | Seismic Wave Attenuation Simulator! |
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Lecture 17: Site Effects and Strong Ground Motion
| Site Amplification: Two Physical Mechanisms! | Seismic Wave Effects in Sedimentary Layers! | Building Failure Encyclopedia! | Interactive ShakeMap Simulator! | Site Amplification & Resonance Simulator! |
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Lecture 18: Earthquake Interactions
| Gutenberg-Richter Law Interactive Tool! | Interactive Gutenberg-Richter Law Simulator! | Interactive Modified Omori Law Simulator! | Modified Omori Law Simulator! | Earthquake Stress Triggering Simulator! |
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