Tectonic hazards: earthquakes, volcanoes, tsunamis: Practice Questions

Which of the following internal earth processes is the primary driver of plate tectonics and the resulting tectonic hazards?

A region is located along a destructive (convergent) plate boundary where oceanic crust is subducting beneath continental crust. Earthquakes in this zone exhibit a distinct pattern known as the Wadati-Benioff zone, with focal depths ranging from very shallow near the trench to deep further inland.

Which of the following statements accurately describes the nature of these earthquakes and their resulting hazards?

In a major subduction zone, two adjacent segments of the plate interface, Segment X and Segment Y, are identified. Segment X is categorized as fully locked (highly coupled), meaning it accumulates elastic strain, while Segment Y exhibits continuous aseismic creep. If Segment X ruptures in a massive megathrust earthquake, why is Segment Y expected to act as a significant barrier to rupture propagation, minimizing the total seismic moment released?

Magma that has been extruded onto the Earth's surface through a volcanic vent is known as:

Island arcs and deep ocean trenches are characteristic landform features typically found at which type of tectonic plate boundary?

Describe the general spatial relationship between the global distribution of earthquakes and volcanoes.

Explain how hot spots lead to the formation of volcanic chains in locations far from the margins of tectonic plates.

With reference to plate tectonic theory, explain why the depth of earthquake foci typically increases progressively as one moves from an oceanic trench toward a nearby volcanic island arc at a destructive plate boundary.

Identify two primary effects of an earthquake on the natural landscape.

Apart from immediate ground shaking, a major earthquake can trigger various secondary impacts. Explain two significant secondary impacts of a powerful earthquake. Furthermore, discuss one preparedness strategy that a community living in a seismically active zone can implement to reduce the risks associated with these secondary impacts.