A few days ago I was talking about tectonic plates that USGS has arranged to visualize in a simple kml of 107 k, and in this it is necessary to recognize that Google Earth has changed our life for what it is possible to see with the simple intuition of those who are not experts in the matter.
This layer of earthquakes allows you to view information about earthquakes now used by the media to give less confusing information.
This is the case of the earthquake that occurred in Honduras on May 28, 2009, north of the island of Roatán; the circle marked in white indicates the 100 kilometers around where an earthquake with less than 7 degrees on the Richter scale is expected to cause serious damage.
Although all that fault known as the Motagua fault, which crosses Guatemala and separates the Caribbean and North American plates, is a tear, on the map this entire section is divided into small segments where the effect of the shock is different. For example, the line marked in yellow is the continental shelf, followed by a section marked in red and then the line in green that corresponds to the oceanic shelf. These tear faults are caused by the expansion of the seabed and their result in millions of years are the submarine mountain ranges of volcanic origin; observe how the islands in the bay are a consequence of this phenomenon and are seen parallel to the fault.
Although Honduras suffered a 7.4 earthquake (according to USGS), 10 deaths are still not quantified after two days, because the epicenter was on the oceanic platform (10 kilometers deep), if it had been on the continental platform, it would have been serious because the damage of tear faults is that their epicenter is usually close to the surface. Earthquakes of a similar magnitude have left fatal results, as is the case in Nicaragua (6.2 degrees, 5 kilometers deep, 10,000 deaths) or El Salvador (7.7 degrees, 39 kilometers deep, 1,259 deaths); since they have been in a subduction zone and closer to large urban centers.
See that you can also see the replicas that happened yesterday:
- In the same fault, 4.8 same day
- Closer to the coast of 4.5
- Near Olanchito, 4.6, this is on mainland.
When selecting the point of the epicenter, other characteristics can be seen, such as the intensity map, which shows in colors the places where there was greater movement on land. Too bad that in this, the USGS maintains a map with a lag, of about 7,000 meters, but if it were to hunt exactly, it would see the areas marked in orange that fall on the border of the departments of Yoro and Cortés, which by the way are separated by the Ulúa river. where the El Progreso bridge collapsed.
Definitely, Internet and Google Earth has changed the way of seeing the world, for that matter, you can already see in the Wikipedia section dedicated to 2009 earthquakes, Although for other purposes We crucified to both.