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Showing posts from July, 2025

Explore the Earth, Maps and Satellite Images

Google Maps and Google Earth are very common platforms today to explore maps and satellite images of the earth. But there are many other ways to explore the earth. Some are listed here.  1.   Earth Explorer This map is developed by USGS helpful to obtain earth imagery across available geo-spatial data types. Users can navigate via interactive map or text search to obtain Landsat satellite imagery, Radar data, UAS data, digital line graphs, digital elevation model data, aerial photos, Sentinel satellite data, some commercial satellite imagery including IKONOS and OrbView3, land cover data, digital map data from the National Map, and many other datasets. Users can search by exact location via the interactive map or input specific coordinates to view what data types are available. 2.   Sentinel Hub This platform developed by  Sinergise has Sentinel, Landsat, and other Earth observation imagery easily accessible for browsing, visualization and analysi...

Low-Angle Subduction Vs High-Angle Subduction

Feature Low-Angle Subduction High-Angle Subduction Dip of slab <30° ~45°–60° (can vary) Subducting slab path Shallow, extends horizontally beneath overriding plate for a long distance Descends steeply into the mantle Example Regions continent-continent collision  or  flat slab subduction , Himalaya (India–Eurasia), central Andes (Peru flat-slab segment) oceanic–continental  or  oceanic–oceanic Japan, Mariana Trench, Tonga, Cascadia, Chile (south) Volcanism Reduced or delayed (far inland) Strong arc volcanism, closer to trench Crustal shortening Prominent, high deformation in foreland (e.g., Himalayas, Andes) Less crustal shortening, more slab rollback Mantle wedge Partially displaced or compressed Well-developed and hydrated (supports volcanism) Plate coupling Strong (high friction) Moderate to weak Topography Thickened crust, high mountain belts (e.g., Himalaya) Island arcs, thinner crust near trench Low-Angle ...

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Geological Maps of Nepal

  List of geological maps different parts of Nepal . Geological Map of Nepal Geological Maps Of Seven Provinces, Nepal Geological Map of Kathmandu Area and Central Mahabharat Range (Stocklin and Bhattarai, 1980) Photogeological Map of Central Nepal (Stocklin and Bhattarai, 1982). Geological maps of 1:50,000  of different parts of Nepal published by DMG. Engineering Geological and Environmental maps of different cities of Nepal published by DMG. Mineral Resources map of Nepal Epicenter map of Nepal Himalaya

Explore the Earth, Maps and Satellite Images

Google Maps and Google Earth are very common platforms today to explore maps and satellite images of the earth. But there are many other ways to explore the earth. Some are listed here.  1.   Earth Explorer This map is developed by USGS helpful to obtain earth imagery across available geo-spatial data types. Users can navigate via interactive map or text search to obtain Landsat satellite imagery, Radar data, UAS data, digital line graphs, digital elevation model data, aerial photos, Sentinel satellite data, some commercial satellite imagery including IKONOS and OrbView3, land cover data, digital map data from the National Map, and many other datasets. Users can search by exact location via the interactive map or input specific coordinates to view what data types are available. 2.   Sentinel Hub This platform developed by  Sinergise has Sentinel, Landsat, and other Earth observation imagery easily accessible for browsing, visualization and analysi...

Geology Of Nepal

The Himalaya was formed due to collision of Indian Plate and Eurasian Plate at about 40 million years ago. It extends in 2400km east - west direction. Its width varies from 230 to 320 km and bounded between the Indo-Gangetic Plain in the south and Tibetan Plateau in the north. Nepal Himalaya occupies the central 800km part. Heim & Gansser 1939 , and Gansser 1964 divided the rocks of the Himalaya into four tectonostratigraphic zones that are characterised by distinctive stratigraphy and physiography. From south to north, it can be divided into five latitudinal morpho-tectonic zones and these are : 1. The Gangatic Plain (Terai) 2. The Sub Himalayan (Chure or Siwalik) 3 Lesser Himalayan (Mahabharat Mountain Range), 4. Greater Himalayan, and 5. Tibetan Himalayan zones (Tethys Himalaya). Each of these zones is clearly identified by their morphological, geological and tectonic features. Main Frontal Thrust (MFT), Main Boundary Thrust (MBT), Main Central Thrust (MCT) and South Tibetan ...