Earthquakes occur when tension is released from inside the crust.

Constructive Plate Margins. In plate tectonics, a divergent boundary or divergent plate boundary (also known as a constructive boundary or an extensional boundary) is a linear feature that exists between two tectonic plates that are moving away from each other.

Saturday's catastrophic earthquake in Nepal occurred because of two converging tectonic plates: the India plate and the overriding Eurasia plate to the north, the U.S. Geological Survey said. Earthquakes along transform boundaries show strike-slip motion on the faults, they form fairly straight linear patterns and tend to be shallow focus earthquakes with depths usually less than about 100 km. An earthquake is the shaking and vibration of the Earth's crust due to movement of the Earth's plates (plate tectonics). Most of these plate margins are under the oceans.

As the plates move apart magma rises from the mantle to the Earth’s surface. As the plates move apart magma rises through the gap, and cools, this boundary … Earthquakes can happen along any type of plate boundary. A constructive (tensional) plate boundary happens where plates move apart. There are three main types of plate boundaries: Constructive plate boundary: At a constructive plate boundary, two plates move apart from each other.

The deformation associated with this plate boundary is partitioned into nearly pure thrust sense movements perpendicular to the boundary over a wide zone to the southwest and nearly pure strike-slip motion along the Main Recent Fault close to the actual plate boundary itself. CAUSE OF tHE HAITI EARTHQUAKE PLATE BOUNDARIES . the rising magma forms shield volcanoes.

This is demonstrated by earthquake focal mechanisms. Despite the topographic rise associated with the ridge, the free-air gravity anomaly is relatively flat and close to zero across the whole structure. The San Andreas Fault is an example of a transform -fault plate boundary along the north western Mexican and California coast. Magma rises through the gap into the earth’s crust and new land is formed. Figure 15 shows gravity anomalies across the Mid-Atlantic Ridge. An example of a constructive boundary is the Mid-Atlantic Ridge. The depth structure of a constructive plate boundary can be further defined from the variation in the Earth's gravity (Box 3). A constructive plate boundary, also known as a divergent boundary is when plates are moving apart.