Podcast
Questions and Answers
What geological feature is commonly formed when two continental plates diverge?
What geological feature is commonly formed when two continental plates diverge?
- A volcanic arc
- A rift valley (correct)
- A subduction zone
- A transform fault
Which type of boundary is characterized by plates moving past each other horizontally?
Which type of boundary is characterized by plates moving past each other horizontally?
- Subduction boundary
- Transform boundary (correct)
- Divergent boundary
- Convergent boundary
What geologic process occurs at mid-ocean ridges?
What geologic process occurs at mid-ocean ridges?
- Subduction
- Seafloor spreading (correct)
- Volcanic eruption
- Continental collision
Which of the following best describes a 'fault' in geological terms?
Which of the following best describes a 'fault' in geological terms?
What is the hanging wall in a normal fault?
What is the hanging wall in a normal fault?
What type of fault is characterized by the hanging wall moving upward relative to the footwall?
What type of fault is characterized by the hanging wall moving upward relative to the footwall?
Which type of fault primarily involves horizontal movement of rocks?
Which type of fault primarily involves horizontal movement of rocks?
Which term describes the slow, steady movement along a fault without significant earthquake activity?
Which term describes the slow, steady movement along a fault without significant earthquake activity?
Which term refers to the scientific study of earthquakes and related phenomena?
Which term refers to the scientific study of earthquakes and related phenomena?
What is the primary difference between P-waves and S-waves?
What is the primary difference between P-waves and S-waves?
What type of seismic wave is known for its rolling motion, similar to ripples on water?
What type of seismic wave is known for its rolling motion, similar to ripples on water?
What is the role of a seismometer in measuring earthquakes?
What is the role of a seismometer in measuring earthquakes?
What does a seismogram record?
What does a seismogram record?
Which scale is used to rate the strength or total energy released by an earthquake?
Which scale is used to rate the strength or total energy released by an earthquake?
What is measured by the intensity of an earthquake?
What is measured by the intensity of an earthquake?
What scale is used to measure earthquake intensity in the Philippines?
What scale is used to measure earthquake intensity in the Philippines?
According to the PHIVOLCS Earthquake Intensity Scale (PEIS), at what intensity level are most people frightened and run outdoors?
According to the PHIVOLCS Earthquake Intensity Scale (PEIS), at what intensity level are most people frightened and run outdoors?
According to the Modified Mercalli Intensity Scale, what is observed at intensity level XII (Cataclysmic)?
According to the Modified Mercalli Intensity Scale, what is observed at intensity level XII (Cataclysmic)?
What is a key characteristic of earthquakes occurring at divergent boundaries?
What is a key characteristic of earthquakes occurring at divergent boundaries?
How does seafloor spreading contribute to tectonic activity?
How does seafloor spreading contribute to tectonic activity?
How do strike-slip faults accommodate the motion of tectonic plates?
How do strike-slip faults accommodate the motion of tectonic plates?
How does the movement of the 'hanging wall' relative to the 'footwall' define a normal fault?
How does the movement of the 'hanging wall' relative to the 'footwall' define a normal fault?
In the context of strike-slip faults, what distinguishes a right-lateral fault from a left-lateral fault?
In the context of strike-slip faults, what distinguishes a right-lateral fault from a left-lateral fault?
What characteristic distinguishes Love waves from Rayleigh waves?
What characteristic distinguishes Love waves from Rayleigh waves?
How does the Mercalli intensity scale differ from the Richter scale in measuring earthquakes?
How does the Mercalli intensity scale differ from the Richter scale in measuring earthquakes?
Based on the PHIVOLCS Earthquake Intensity Scale (PEIS), what observations would classify an earthquake as intensity VII (Destructive)?
Based on the PHIVOLCS Earthquake Intensity Scale (PEIS), what observations would classify an earthquake as intensity VII (Destructive)?
What is the primary mechanism driving tectonic earthquakes at divergent plate boundaries?
What is the primary mechanism driving tectonic earthquakes at divergent plate boundaries?
How does the behavior of S-waves provide evidence about the Earth's interior?
How does the behavior of S-waves provide evidence about the Earth's interior?
Which of the following fault types is most likely to be associated with the formation of a mountain range?
Which of the following fault types is most likely to be associated with the formation of a mountain range?
How do surface waves generally behave differently from body waves as they propagate from the epicenter of an earthquake?
How do surface waves generally behave differently from body waves as they propagate from the epicenter of an earthquake?
What would be the best description of a location experiencing intensity level X on the PHIVOLCS Earthquake Intensity Scale (PEIS)?
What would be the best description of a location experiencing intensity level X on the PHIVOLCS Earthquake Intensity Scale (PEIS)?
Which statement could best summarize the relationship between earthquake magnitude and earthquake frequency worldwide?
Which statement could best summarize the relationship between earthquake magnitude and earthquake frequency worldwide?
How might scientists use seismic data to understand the potential for future earthquakes in a specific region?
How might scientists use seismic data to understand the potential for future earthquakes in a specific region?
Consider a scenario where a seismograph records both P-waves and surface waves from an earthquake. What information can be reasonably inferred from the time difference between their arrival?
Consider a scenario where a seismograph records both P-waves and surface waves from an earthquake. What information can be reasonably inferred from the time difference between their arrival?
Imagine a major left-lateral strike-slip fault zone runs through a densely populated area. What long-term impact might this tectonic setting have on the region's geography and infrastructure planning?
Imagine a major left-lateral strike-slip fault zone runs through a densely populated area. What long-term impact might this tectonic setting have on the region's geography and infrastructure planning?
A hypothetical area on Earth experiences frequent earthquakes, but they are rarely felt by humans and cause no damage. Which combination of factors would most logically explain this observation?
A hypothetical area on Earth experiences frequent earthquakes, but they are rarely felt by humans and cause no damage. Which combination of factors would most logically explain this observation?
Two cities, A and B, are located near the same fault line. After a major earthquake, City A, built on solid bedrock, experiences less damage than City B, situated on loosely packed sediments. What phenomenon best accounts for this difference?
Two cities, A and B, are located near the same fault line. After a major earthquake, City A, built on solid bedrock, experiences less damage than City B, situated on loosely packed sediments. What phenomenon best accounts for this difference?
A seismologist observes that P-waves arrive at a seismic station, but S-waves do not. Furthermore, the P-waves are significantly weaker than expected, considering the known magnitude of the earthquake. Where is this seismic station likely located?
A seismologist observes that P-waves arrive at a seismic station, but S-waves do not. Furthermore, the P-waves are significantly weaker than expected, considering the known magnitude of the earthquake. Where is this seismic station likely located?
Consider a scenario: a large earthquake occurs along a subduction zone where historical records show a recurring pattern of similar events every 80-120 years. However, for the past 150 years, no major earthquake has occurred in that region. What term best describes this situation, and what does it suggest about future risk?
Consider a scenario: a large earthquake occurs along a subduction zone where historical records show a recurring pattern of similar events every 80-120 years. However, for the past 150 years, no major earthquake has occurred in that region. What term best describes this situation, and what does it suggest about future risk?
Flashcards
Tectonic Earthquakes
Tectonic Earthquakes
Earthquakes that occur at tectonic plate boundaries.
Divergent Boundaries
Divergent Boundaries
Boundaries where two plates move apart.
Rift valley formation
Rift valley formation
When two continental plates diverge forming a valley.
Mid-Ocean Ridges
Mid-Ocean Ridges
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Seafloor Spreading
Seafloor Spreading
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Transform Boundaries
Transform Boundaries
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Fault
Fault
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Fault Creep
Fault Creep
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Normal Fault
Normal Fault
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Hanging wall
Hanging wall
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Footwall
Footwall
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Reverse Fault
Reverse Fault
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Strike-Slip Fault
Strike-Slip Fault
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Right Lateral Strike-Slip Fault
Right Lateral Strike-Slip Fault
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Left Lateral Strike-Slip Fault
Left Lateral Strike-Slip Fault
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Oblique Slip Fault
Oblique Slip Fault
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Seismology
Seismology
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Magnitude Measurement
Magnitude Measurement
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Body Waves
Body Waves
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Primary Waves (P-Waves)
Primary Waves (P-Waves)
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Secondary Waves (S-Waves)
Secondary Waves (S-Waves)
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Surface Waves
Surface Waves
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Rayleigh Waves
Rayleigh Waves
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Love Waves
Love Waves
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Seismometer
Seismometer
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Seismograph
Seismograph
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Seismogram
Seismogram
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Richter Scale
Richter Scale
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Intensity
Intensity
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PHIVOLCS Earthquake Intensity Scale (PEIS)
PHIVOLCS Earthquake Intensity Scale (PEIS)
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Study Notes
Tectonic Earthquakes
- Divergent boundaries occur when two plates move apart.
- Spreading of two plates causes magma to rise and solidify, forming new crust.
- Earthquakes along divergent zones are usually small and cause less damage compared to other boundaries.
- Divergence of two continental plates lead to the formation of a rift valley.
- Divergence of two oceanic plates form mid-ocean ridges.
- Mid-ocean ridges can be described as mountain ranges on the ocean floor.
- Seafloor spreading is a geologic process where two plates move apart, creating new crust on the seafloor.
- Transform boundaries occur where two plates slide past each other laterally.
- These boundaries are commonly defined as a series of faults.
Faults
- A fault is a fracture or zone of fractures between two blocks of rock.
- Faults facilitates relative movement between the blocks of rock.
- Faults can move rapidly, causing noticeable earthquakes or move slowly in a form of creep.
- Creep is the slow, steady movement of faults without associated earthquake activities.
- Normal fault - the hanging wall moves down relative to the footwall.
- The hanging wall is the block of rock above the fault, and the footwall is the rock below the fault.
- Foot wall is the rock formation beneath a fault line in a Earth's crust.
- Reverse fault - the hanging wall moves up relative to the footwall.
- Strike-slip fault - rocks on either side of a nearly vertical fault plane move horizontally.
- Right Lateral (dextral) strike slip fault - the displacement of the far block appears to be to the right when viewed from either side.
- Left Lateral (sinistral) strike slip fault - the displacement of the far block is to the left when viewed from either side.
- Oblique Slip Fault - a combination of dip slip and strike-slip faults.
Measuring Earthquakes
- Seismology is the scientific study of earthquakes and related phenomena, especially volcanic eruptions.
- Earthquakes can be measured in terms of magnitude and intensity.
- Magnitude measurement is done by recording seismic waves and analyzing the data using a scale.
- Seismic waves are classified into body waves and surface waves.
- Body waves travel through the Earth's interior.
- Primary (P) waves are pressure waves that travel at the greatest velocity, particle motion is parallel to the direction of wave propagation (sound waves).
- Secondary (S) waves are shear or shaking waves that travel slower than P-waves, particle motion is perpendicular to the direction of wave propagation.
- Surface waves travel along the Earth's surface.
- Rayleigh waves travel like ripples on water, also known as ground roll.
- Love waves cause horizontal shearing of the ground and travel slightly faster than Rayleigh waves.
- A seismometer is the internal part of the instrument that may be a pendulum or a mass mounted on a spring.
- Seismographs are instruments used to record the motion of the ground during an earthquake.
- Seismographs are installed worldwide as part of a seismographic network.
- A seismogram is the recording of the ground shaking at the specific location of the instrument.
- Richter Scale - logarithmic scale used to rate the strength or total energy of an earthquake, scale ranges from 1 to 9.
- Intensity is the effect of an earthquake on the Earth's surface.
- Modified Mercalli Scale is the common measurement system for intensity.
- PEIS (PHIVOLCS Earthquake Intensity Scale) is used in the Philippines.
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