You can use this page to browse through all of the individual visualizations that have been cataloged in our digital library. You can also browse them as collections related to particular topics
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How Shifting Plates Caused the Earthquake and Tsunami in Japan
This page features USGS visualizations including a slide show of the sudden movement of the Pacific tectonic plate under the North American plate caused a massive earthquake and a tsunami. It also contains maps of the magnitude of shaking and predicted tsunami wave heights from the March 11, 2011 earthquake and tsunami in Japan.
HydroViz is an educational 'virtual' hydrologic observatory developed for a 'real' watershed. It is based on integration of field data, remote sensing observations and computer simulations of hydrologic variables and processes. The main purpose of HydroViz is to support hydrology education in engineering and earth science courses. HydroViz is designed to be used in junior/senior level courses within Civil Engineering and Earth Sciences curriculum, and can also be used in introductory-graduate courses. The educational modules can be introduced to the students at different stages within a single course, where each module can serve as an educational companion to the technical subject covered by the instructor. For example, in an Engineering Hydrology class, the HydroViz module on 'Exploring Field Equipment' can be assigned to the students while the instructor is covering a textbook chapter that deals with hydrologic measurements. Similarly, the instructor can use the first four modules that focus on watershed physiographical characteristics to support students learning of basic watershed concepts beyond pure textbook coverage of such topics. For junior/senior level courses, HydroViz modules on runoff analysis and Curve-Number calculations can be used as real-world example applications to supplement homework problems typically assigned for hypothetical watershed sites. Advanced modules in HydroViz (e.g., remote-sensing observations and numerical model simulations) are more appropriate to be covered at senior-level courses or a first-year graduate course. The entire suite of modules in HydroViz can used in a graduate-level course for students to refresh and review their prior knowledge on the subject matter and reemphasize concepts that may have not been covered in their undergraduate curriculum. HydroViz is fully web-based, web-accessible with Google Earth embedded into it. It can run on a typical desktop computer with internet access and doesn't require any specific software packages.
My World GIS
My World is a Geographic Information System (GIS) designed specifically for use in middle school through college classrooms. My World provides a carefully selected subset of the features of a professional GIS environment. These features include multiple geographic projections, table and map views of data, distance-measurement tools, buffering and query operations, and customizable map display. They have been selected to provide the greatest value to students without overwhelming them with complexity. The features are accessed through a supportive interface designed with the needs of students and teachers in mind. My World can import data from the industry-standard shapefile format, as well as from tab and comma-delimited text files. In the future, it will be able to communicate directly with GPS-enabled handheld devices. The web site features links to download My World GIS software along with sample data and documentation. This resource is part of the Using Global Data Sets collection. http://serc.carleton.edu/NAGTWorkshops/globaldata02/
Listening to the 2004 Indian Ocean tsunami quake
This resource is an abstract. This study tracks the movement of the rupture that caused the December 26, 2004 Indian Ocean tsunami by comparing recordings of sound waves from five sensors located around the Indian Ocean. The data were used to triangulate the location of sound wave source. Results indicated that the rupture first moved northwest at 2.4 kilometers per second along the Sunda trench then slowed to 1.5 kilometers per second around 600 kilometers from the earthquake's epicenter. The author indicates that the slower speed of the rupture was unusual for an earthquake caused by a rupture close to the surface.
Estimating Hurricane-Force Winds
This resource provides an abstract: To better measure hurricane-force winds, the authors studied various types of synthetic aperture radar (SAR) wind retrieval schemes applied to the high winds observed in 2004 during Hurricane Ivan. They found that the newly-developed Cmod5 empirical geophysical model function (GMF) outperforms the commonly used Cmod4 GMF in analyzing these high winds. They suggest that continued analysis of SAR wind mapping under extreme wind conditions can be a useful tool for hurricane tracking and prediction.
Tsunami "shadows" may allow remote detection of tidal waves
This resource provides an abstract. This study investigates tsunami shadows, extended dark strips on the ocean surface before a tsunami. Such shadows are found to result from an air-sea interaction induced by tsunami-related atmospheric disturbances. Results suggest that remote surface water observations can be used to detect deep ocean tsunamis via their shadows and thus provide significantly more reliable and earlier warning before the large waves strike vulnerable shores.
Magma shakes up earthquake locations
Numerical models were employed to examine the relationships between the orientation of volcanotectonic faults and magma movement. It was found that the direction of movement on strike-slip faults should be opposite to that predicted on the basis of regional stresses. The results do not explain the location of some volcanotectonic earthquakes and that the locations of preexisting faults may be more important in influencing the location of these earthquakes.
How volcanic eruptions cause tsunamis
This study investigates the effect of pyroclastic flows on tsunami generation. The authors analyzed several possible mechanisms that occur when the particle rich flows encounter water and conclude that the volume and density of the basal flow has a close correlation with the wave's amplitude and wavelength, which can be used to model the water movement in lakes, bays and oceans.