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Do deep-focus earthquakes occur near trenches?

Do deep-focus earthquakes occur near trenches?

(ii) Deep-focus earthquakes appear to be associated mainly with the mountains and ocean trenches that surround the Pacific Ocean (for example, near the coast of South America, or the coast of Japan).

Where do most deep-focus earthquakes occur?

The deepest earthquakes occur within the core of subducting slabs – oceanic plates that descend into the Earth’s mantle from convergent plate boundaries, where a dense oceanic plate collides with a less dense continental plate and the former sinks beneath the latter.

Do earthquakes occur in deep ocean trenches?

Ocean trenches are steep depressions in the deepest parts of the ocean [where old ocean crust from one tectonic plate is pushed beneath another plate, raising mountains, causing earthquakes, and forming volcanoes on the seafloor and on land.

What causes deep-focus earthquakes?

A deep focus earthquake occurs when two tectonic plates slide towards one another followed by subduction, or when the mineral olivine is in a transitional phase. These are typical of the subduction zone of the earth which are seismically active zones, often existing in patterns as in Wadati-Benioff zones.

Do most deep-focus earthquakes occur in the Atlantic or Pacific Basin?

Most deep-focus earthquakes occur along the margin of the (Atlantic/Pacific) basin.

Why do earthquakes occur at mid-ocean ridges?

Hot magma rises from the mantle at mid-ocean ridges, pushing the plates apart. Earthquakes occur along the fractures that appear as the plates move apart.

At what depth do earthquakes occur?

Earthquakes can occur anywhere between the Earth’s surface and about 700 kilometers below the surface. For scientific purposes, this earthquake depth range of 0 – 700 km is divided into three zones: shallow, intermediate, and deep.

Why do deep earthquakes occur at subduction zones?

Deep earthquakes occur in subduction zones — where one of the tectonic plates floating on the surface of the Earth dives under another and is “subducted” into the mantle. Within the sinking slabs of crust, earthquakes cluster at some depths and are sparse in others.

What ocean floor features are associated with deep earthquakes?

Features rising up from the ocean floor include seamounts, volcanic islands and the mid-oceanic ridges and rises.

Where do the deepest earthquakes occur quizlet?

The deepest earthquakes occur where plates collide along a convergent plate boundary.

In which ocean basin do most deep-focus earthquakes occur?