The Telegraphic Plateau is a significant feature of submarine geography. Located along the North Atlantic seabed, it provided a relatively shallow and stable path for the pioneering telecommunications cables that first linked North America and Europe. While most geography questions focus on land-basRead more
The Telegraphic Plateau is a significant feature of submarine geography. Located along the North Atlantic seabed, it provided a relatively shallow and stable path for the pioneering telecommunications cables that first linked North America and Europe. While most geography questions focus on land-based plateaus, the Telegraphic Plateau highlights the diversity of the lithosphere’s surface underwater. It is part of the broader Mid-Atlantic Ridge system’s flank, demonstrating that plateau-like “tablelands” exist even on the ocean floor, serving critical roles in human technological history and deep-sea sediment accumulation.
Before Lehmann, scientists thought the entire core was liquid. She noticed that some P-waves were showing up in the "shadow zone" where they shouldn't be. She theorized that these waves were bouncing off a solid inner sphere. Her discovery changed our entire model of the Earth's interior. We now knoRead more
Before Lehmann, scientists thought the entire core was liquid. She noticed that some P-waves were showing up in the “shadow zone” where they shouldn’t be. She theorized that these waves were bouncing off a solid inner sphere. Her discovery changed our entire model of the Earth’s interior. We now know the inner core is a solid ball of iron and nickel, kept solid by immense pressure despite temperatures exceeding 5,000°C. This solid inner core is essential for the Earth’s rotation and the stabilization of our magnetic field.
Because the contact area between two subducting plates is massive (hundreds of kilometers long and wide), it can store an incredible amount of elastic energy. When this "megathrust" finally slips, the energy release is equivalent to thousands of atomic bombs. All of the top 10 largest earthquakes inRead more
Because the contact area between two subducting plates is massive (hundreds of kilometers long and wide), it can store an incredible amount of elastic energy. When this “megathrust” finally slips, the energy release is equivalent to thousands of atomic bombs. All of the top 10 largest earthquakes in recorded history, including the 1960 Chile (9.5) and 2011 Japan (9.1) quakes, were megathrust events. These boundaries are also unique because they involve vertical seafloor movement, making them the primary source of trans-oceanic tsunamis.
The Richter scale was the first successful attempt to give a single number to an earthquake's size. However, because it only measures one peak on a seismogram, it doesn't account for the "total" energy of very long-duration quakes. It is a "Local Magnitude" scale. While the public still uses the terRead more
The Richter scale was the first successful attempt to give a single number to an earthquake’s size. However, because it only measures one peak on a seismogram, it doesn’t account for the “total” energy of very long-duration quakes. It is a “Local Magnitude” scale. While the public still uses the term “Richter,” scientists have largely moved to the Moment Magnitude Scale, which looks at the physical “work” done by the fault. Still, the Richter scale’s logarithmic logic remains the foundation for how we perceive and communicate earthquake power today.
Think of attenuation as the "muffling" of sound as you move away from a speaker. In the Earth, waves lose energy every time they move a particle of rock. Soft, hot or fractured rocks (like those near volcanic arcs) attenuate waves very quickly. Conversely, old, cold and solid "cratons" have low atteRead more
Think of attenuation as the “muffling” of sound as you move away from a speaker. In the Earth, waves lose energy every time they move a particle of rock. Soft, hot or fractured rocks (like those near volcanic arcs) attenuate waves very quickly. Conversely, old, cold and solid “cratons” have low attenuation, allowing seismic energy to travel great distances. This is why a magnitude 6.0 earthquake in the Eastern US (low attenuation) is felt over a much larger area than a 6.0 in California (high attenuation/fractured crust).
Where is the Telegraphic Plateau located? (A) North Atlantic Ocean (B) South Indian Ocean (C) North Pacific Ocean (D) South Pacific Ocean
The Telegraphic Plateau is a significant feature of submarine geography. Located along the North Atlantic seabed, it provided a relatively shallow and stable path for the pioneering telecommunications cables that first linked North America and Europe. While most geography questions focus on land-basRead more
The Telegraphic Plateau is a significant feature of submarine geography. Located along the North Atlantic seabed, it provided a relatively shallow and stable path for the pioneering telecommunications cables that first linked North America and Europe. While most geography questions focus on land-based plateaus, the Telegraphic Plateau highlights the diversity of the lithosphere’s surface underwater. It is part of the broader Mid-Atlantic Ridge system’s flank, demonstrating that plateau-like “tablelands” exist even on the ocean floor, serving critical roles in human technological history and deep-sea sediment accumulation.
See lessThe ‘Lehmann Discontinuity’ marks the boundary between which two layers?
Before Lehmann, scientists thought the entire core was liquid. She noticed that some P-waves were showing up in the "shadow zone" where they shouldn't be. She theorized that these waves were bouncing off a solid inner sphere. Her discovery changed our entire model of the Earth's interior. We now knoRead more
Before Lehmann, scientists thought the entire core was liquid. She noticed that some P-waves were showing up in the “shadow zone” where they shouldn’t be. She theorized that these waves were bouncing off a solid inner sphere. Her discovery changed our entire model of the Earth’s interior. We now know the inner core is a solid ball of iron and nickel, kept solid by immense pressure despite temperatures exceeding 5,000°C. This solid inner core is essential for the Earth’s rotation and the stabilization of our magnetic field.
See lessWhich region experiences ‘Megathrust’ earthquakes? (A) Mid-Atlantic Ridge (B) East African Rift (C) Subduction Zones (D) San Andreas Fault
Because the contact area between two subducting plates is massive (hundreds of kilometers long and wide), it can store an incredible amount of elastic energy. When this "megathrust" finally slips, the energy release is equivalent to thousands of atomic bombs. All of the top 10 largest earthquakes inRead more
Because the contact area between two subducting plates is massive (hundreds of kilometers long and wide), it can store an incredible amount of elastic energy. When this “megathrust” finally slips, the energy release is equivalent to thousands of atomic bombs. All of the top 10 largest earthquakes in recorded history, including the 1960 Chile (9.5) and 2011 Japan (9.1) quakes, were megathrust events. These boundaries are also unique because they involve vertical seafloor movement, making them the primary source of trans-oceanic tsunamis.
See lessThe ‘Richter Scale’ is a measure of magnitude based on: (A) The total area of the fault. (B) The maximum amplitude of the S-wave recorded on a specific seismograph. (C) The number of buildings destroyed. (D) The duration of the shaking in minutes.
The Richter scale was the first successful attempt to give a single number to an earthquake's size. However, because it only measures one peak on a seismogram, it doesn't account for the "total" energy of very long-duration quakes. It is a "Local Magnitude" scale. While the public still uses the terRead more
The Richter scale was the first successful attempt to give a single number to an earthquake’s size. However, because it only measures one peak on a seismogram, it doesn’t account for the “total” energy of very long-duration quakes. It is a “Local Magnitude” scale. While the public still uses the term “Richter,” scientists have largely moved to the Moment Magnitude Scale, which looks at the physical “work” done by the fault. Still, the Richter scale’s logarithmic logic remains the foundation for how we perceive and communicate earthquake power today.
See lessIn seismology, ‘Attenuation’ refers to:
Think of attenuation as the "muffling" of sound as you move away from a speaker. In the Earth, waves lose energy every time they move a particle of rock. Soft, hot or fractured rocks (like those near volcanic arcs) attenuate waves very quickly. Conversely, old, cold and solid "cratons" have low atteRead more
Think of attenuation as the “muffling” of sound as you move away from a speaker. In the Earth, waves lose energy every time they move a particle of rock. Soft, hot or fractured rocks (like those near volcanic arcs) attenuate waves very quickly. Conversely, old, cold and solid “cratons” have low attenuation, allowing seismic energy to travel great distances. This is why a magnitude 6.0 earthquake in the Eastern US (low attenuation) is felt over a much larger area than a 6.0 in California (high attenuation/fractured crust).
See less