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Flashcards in Cierto y Embuste Deck (36):
1

Rock strength and ductility are dependent on confining pressure.

CIERTO

2

Whereas thrust faults occur in extensional tectonic terrains, normal faults are the result of strong compression forces.

EMBUSTE

3

Large strike slip faults the cut through the lithosphere and accommodate the movements between tectonic plates are transform faults.

CIERTO

4

Seismic waves are more amplified by rock than loose sediment.

EMBUSTE

5

The Richter Magnitude scale measures the absolute energy released by an earthquake.

CIERTO

6

The 1918 and 1867 earthquakes that affected Puerto Rico were caused by extension within the plate boundary.

CIERTO

7

The intensity of the 1918 earthquake was greater in Rincon than in Mayaguez.

EMBUSTE

8

Aftershocks are produced by the release of the viscous component of the accumulated strain.

CIERTO

9

P-waves cannot travel through liquids.

EMBUSTE

10

The seismic waves which cause the most damage to structures are compressional P waves.

EMBUSTE

11

The Point on the surface of the earth directly above an earthquake is called the hypocenter.

EMBUSTE

12

The intensity of the 1918 earthquake was greater in Mayaguez than in Rincon.

CIERTO

13

Beta= sqrt(mu/ro) is the equation for the velocity of a S-wave.

CIERTO

14

μ is the modulus of elasticity.

EMBUSTE

15

α = √ (κ + 4/3μ) /ρ in this equation k is the bulk modulus or compresibility.

CIERTO

16

Noncohesive sediments form slopes at their angle of repose.

CIERTO

17

High water pressure or outflow decrease the potential for land sliding.

EMBUSTE

18

Soil deposits formed by mass wasting especially rock falls are called alluvium.

EMBUSTE

19

Normal faults occur in extensional tectonic terrains, whereas thrust faults are the result of strong compressive forces.

CIERTO

20

The point on the surface of the earth directly above an earthquake is called the epicenter.

CIERTO

21

The Mercalli Itensity scale measures the absolute energy released by an earthquake.

EMBUSTE

22

U-PB dating is better for dating Quaternary (

EMBUSTE

23

Most of the water on land is in glaciers.

CIERTO

24

Cohesive sediments form slopes at their angle of repose.

EMBUSTE

25

The suspended load of a river is mainly composed of sand and gavel.

EMBUSTE

26

The Rio Grande del Añasco is a braided stream.

EMBUSTE

27

The oldest crust in the earth underlies the oceans.

EMBUSTE

28

The San Lorenzo and Utuado Batholiths formed in the Cretaceous period about 70 million years ago.

CIERTO

29

A rise in sea level results in rivers down cutting their gradients.

EMBUSTE

30

The Mameyes landslide was caused by slip on bedding planes and joints.

CIERTO

31

Wide and shallow channels usually form when river banks are composed of slit and clay.

EMBUSTE

32

The landslide in Bo. Piñales Arriba , Añasco formed as a slump in weathered rock.

CIERTO

33

Soil deposits formed by mass wasting specially rock falls are called colluvium.

CIERTO

34

Lag time is decreased by urbanization.

CIERTO

35

a=velocity of surface waves at air-rock interface.

EMBUSTE

36

The 1918 and 1867 earthquakes were caused by subduction of the North American Plate.

EMBUSTE