Falla Inversa—En una falla inversa, el bloque encima de la falla (pared colgante) se mueve hacia arriba con respecto al bloque ubicado o debajo de la falla (pared fija). Este movimiento es causado por fuerzas compresionales y resulta en acortamientos. Es llamada falla de corrimiento si el buzamiento (pendiente) del plano de la falla es pequeño

1) What is a hotspot? A volcanic 'hotspot' is an area in the upper mantle from which heat rises in a plume from deep in the Earth. High heat and lower pressure at the base of the mantle facilitates melting of the rock. This melt, called magma, rises through cracks to the surface and forms volcanoes. As the tectonic plate moves over the stationary hot spot, the volcanoes are rafted away and new ones form in their place. This results in chains of volcanoes, such as the Hawaiian Islands.

In this Incorporated Research Institutions for Seismology resource we look at a cross section of the shallow crust in a basin and range. Earthquake produces seismic waves that bump an array of seismic stations. One station records the arrival of the seismic waves on a seismogram.

In this Incorporated Research Institutions for Seismology resource Robert Butler, a University of Portland environmental science professor,talks about the March 11, 2011 Magnitude 9.0 earthquake and tsunami that impacted Northern Japan.

Roger Groom, science teacher at Mount Tabor Middle School, demonstrates how a slinky is a good analogy for P & S seismic waves. He also points out where the model fails to fully mimic seismic-wave behavior

In this Incorporated Research Institutions for Seismology resource we look at a demonstration comparing layers of the earth to layers of hard-boiled egg.

In this Incorporated Research Institutions for Seismology resource we look at how to locate where an earthquake occurred by using the P- and S-wave arrival times of seismic waves to three different seismograph stations.

In this Incorporated Research Institutions for Seismology resource we look at the four basic types of plate tectonic boundaries.

This animation of a part of Alan L. Jones' Seismic Waves program works was produced by R.Welti, IRIS. The 2004 Sumatra generated seismic waves that traveled through and around the globe. The seismic waves were recorded on the seismic stations shown on the animation. Watch the seismograms at the top of the animation develop with time. Notice that the further from the earthquake is, not only to the first waves arrive later, but the time between the P and S waves is increasing.

In this Incorporated Research Institutions for Seismology resource we look at the magnitude 7.0 earthquake that hit the South Island of New Zealand on friday, September 3, 2010 at 16:35:46 UTC.

In this Incorporated Research Institutions for Seismology resource we look at how the three basic types of seismic waves and look at the different wave behaviour in the earth.

In this Incorporated Research Institutions for Seismology resource Robert Butler, a University of Portland environmental science professor,talks about the March 11, 2011 Magnitude 9.0 earthquake and tsunami that impacted Northern Japan.

Life of Hotspot Volcanic Island follows the animation 'Hotspot Volcanism', and shows the evolution of a single island as it forms over the hotspot. Includes the initial eruption from the sea floor until it moves far from the hotspot and erodes to an atoll.

In this Incorporated Research Institutions for Seismology resource we look at an animation which illustrates a 500 million year history of continental breakup and migration of the North American continent, with a star indicating the location of NMSZ rocks through time.

In this Incorporated Research Institutions for Seismology resource we look at how to design a structure to withstand an earthquake, including using simple materials to engineer shear walls.

In this Incorporated Research Institutions for Seismology resource we look at an ocean/continent convergent boundary. We see the denser thinner oceanic plate diving beneath the continental plate. The down-going oceanic plate eventually melts and gets absorbed into the mantle. Such destruction (recycling) of crust takes place along convergent boundaries where plates collide and a plate is subducted.

In this Incorporated Research Institutions for Seismology resource we look at how science is communicated to the media and the general public.

In this Incorporated Research Institutions for Seismology resource Robert Butler, a University of Portland environmental science professor,talks about the March 11, 2011 Magnitude 9.0 earthquake and tsunami that impacted Northern Japan.

In this Incorporated Research Institutions for Seismology resource Robert Butler, a University of Portland environmental science professor,talks about the March 11, 2011 Magnitude 9.0 earthquake and tsunami that impacted Northern Japan.

In this Incorporated Research Institutions for Seismology resource we look at how different seismic waves travel through and across the surface of the Earth.

In this Incorporated Research Institutions for Seismology resource we look at the 1964 Great Alaska Earthquake, which occurred on Good Friday, March 27th. It rocked the state and shook the ground for between four and five minutes. At magnitude 9.2, it was the second largest quake ever recorded by seismometers. This animation shows the underlying causes of that earthquake, and tells how research on the ground deformation contributed to confirmation of early theories of plate tectonics.