Understanding Earthquake Mechanics, Plate Tectonics, and Building Seismic Behavior
1. A. Elastic Rebound Theory of an Earthquakes
- Continuous Plate Movement: Tectonic plates are continuously moving due to forces acting inside the Earth.
- Stress Accumulation: Rocks along a fault may be locked due to friction, while the plates continue to move. This causes stress to accumulate.
- Elastic Deformation: The rocks slowly bend and deform because of the increasing stress and store elastic strain energy.
- Breaking Point: When the accumulated stress becomes greater than the strength and frictional
Hydroelectric and Nuclear Power Plant Engineering
Classification of Hydroelectric Power Plants
Based on Water Availability
Hydroelectric plants are classified as run-of-river, storage, and pumped-storage plants:
- Run-of-river plant: It uses the natural flow of a river with little or no water storage.
- Storage plant: A dam is constructed to store a large quantity of water in a reservoir for continuous power generation.
- Pumped-storage plant: Water is pumped to an upper reservoir during low-load periods and released to generate power during peak-load periods.
Silicate Mineral Structures and the Geological Rock Cycle
Silicate Materials and Mineral Structures
Week 7: Silicate materials contain silicon and oxygen and make up 90% of all minerals. The fundamental building block is the silicon tetrahedron (SiO4), often found in silica (SiO2).
Common Silicate Mineral Groups
- Olivine: A silicate mineral group with isolated tetrahedra, common in ultramafic and mafic rocks.
- Isolated tetrahedra: A silicate structure in which silica tetrahedra do not share oxygen with each other.
- Pyroxene: A silicate mineral group with a single-
Structural Geology: Foliation, Lineation, Faults, and Folds
Foliation in Metamorphic Rocks
Foliation is a broad term for any planar, parallel fabric or arrangement of elongated or flaky mineral grains developed within rocks.
- Slaty Cleavage: A very fine-grained, highly pervasive planar structural fabric common in low-grade metamorphic slates, causing them to split cleanly. It usually develops parallel to the axial plane of regional folds.
- Schistosity: A coarser-grained foliation developed in higher-grade metamorphic rocks (schists) where flaky minerals like
Earth Geodesy, Plate Tectonics, and Planetary Evolution
Introduction to Geodesy and Earth’s Shape
The study of the Earth begins with its physical shape and the forces that govern it. While gravitation alone would pull the Earth into a perfect sphere, its rotation creates centrifugal forces that result in an oblate ellipsoid. We define the Geoid as a surface of equal gravitational potential, which corresponds to mean sea level; however, because of uneven mass distribution, the Geoid exhibits irregularities. On a smaller scale, the actual surface of the
Read MoreAquatic Ecosystem Dynamics: Lakes and Estuaries
Q1. Vertical Stratification: Lakes vs. Estuaries
| Feature | Lakes | Estuaries |
|---|---|---|
| Main driver of density gradient | Temperature (thermocline) | Salinity (halocline) ± temperature |
| Layer names | Epilimnion / thermocline / hypolimnion | Surface / pycnocline / bottom |
| Mixing regime types | Polymictic, dimictic, monomictic, meromictic | Salt-wedge, partially-mixed, well-mixed |
| Strength controls | Solar heating, wind, depth/fetch | River discharge vs. tidal mixing energy |
| Temporal variation | Seasonal (turnover) | Tidal (hourly) + seasonal (river pulses) |