Jump to content

File:Tahiti, French Polynesia - NASA Earth Observatory.jpg

Page contents not supported in other languages.
This is a file from the Wikimedia Commons
From Wikipedia, the free encyclopedia

Tahiti,_French_Polynesia_-_NASA_Earth_Observatory.jpg (720 × 480 pixels, file size: 137 KB, MIME type: image/jpeg)

Summary

Description

To download the full resolution and other files go to: earthobservatory.nasa.gov/IOTD/view.php?id=78218&src=...

In August 1768, Captain James Cook, naturalist Joseph Banks, and a shipload of sailors set sail from England to Tahiti to observe the Transit of Venus. Camped out on Point Venus, they witnessed the event on June 3, 1769. Cook sketched the transit, but Banks had surprisingly little to say about it. Perhaps he was distracted by the wonders of the island itself.

The Enhanced Thematic Mapper Plus on the Landsat 7 satellite captured this natural-color image of Tahiti on July 11, 2001. This island is part of a volcanic chain formed by the northwestward movement of the Pacific Plate over a fixed hotspot. Tahiti consists of two old volcanoes—Tahiti-Nui in the northwest and Tahiti-Iti in the southeast—linked by an isthmus.

Through studies of its rock layers, geologists have figured out the likely history of Tahiti-Nui. Today it is roughly round, and it was roughly round when it first formed as a volcanic shield between 1.4 million and 870,000 years ago. But between then and now, it had a different contour. Both the northern and southern flanks of Tahiti-Nui collapsed sometime around 860,000 years ago, gouging massive arcs out of the island’s perimeter. Soon after the northern flank collapse, a second shield volcano began forming. Volcanic material on the northern side of Tahiti-Nui eventually overtopped the original volcanic structure and started filling in the southern depression.

Although Tahiti-Nui now has a fairly symmetrical contour, it has an asymmetrical three-dimensional shape. Mountains are taller on the northern half of the island.

Yet something else besides volcanic activity has shaped Tahiti: rain. Heavy tropical rains have carved deep valleys, some with nearly vertical walls up to 1,000 meters (3,000 feet) tall. The angled sunlight in this image brightens some slopes, while leaving others in shadow. Tahiti’s sharp relief has complicated the geological surveys because they cause so much erosion. But the same rains have also promoted the growth of the lush plants that carpet both Tahiti-Nui and Tahiti-Iti.

Though the Transit of Venus was the stated objective of the British expedition, Banks was likely more interested in Tahiti’s plants. Specimens he collected from Tahiti, New Zealand, South America, Australia, and Java accounted for roughly 1,300 new species, and his famed collected is now stored at the Natural History Museum in London.

Complementing the rich life on land is marine life around Tahiti’s perimeter. Coral reefs fringe the island, and the reefs are thickest on the southern and western sides. Reefs frequently form along the submerged slopes of volcanic islands.

NASA Earth Observatory image by Jesse Allen and Robert Simmon, using Landsat data from the U.S. Geological Survey. Caption by Michon Scott.

The Earth Observatory's mission is to share with the public the images, stories, and discoveries about climate and the environment that emerge from NASA research, including its satellite missions, in-the-field research, and climate models.

Like us on Facebook

Follow us on Twitter

Add us to your circles on Google+
Date
Source Tahiti, French Polynesia
Author NASA's Earth Observatory
Camera location17° 41′ 24.61″ S, 149° 22′ 33.63″ W Kartographer map based on OpenStreetMap.View this and other nearby images on: OpenStreetMapinfo

Licensing

w:en:Creative Commons
attribution
This file is licensed under the Creative Commons Attribution 2.0 Generic license.
You are free:
  • to share – to copy, distribute and transmit the work
  • to remix – to adapt the work
Under the following conditions:
  • attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
This image was originally posted to Flickr by NASA Earth Observatory at https://www.flickr.com/photos/68824346@N02/7180520297. It was reviewed on 2 July 2012 by FlickreviewR and was confirmed to be licensed under the terms of the cc-by-2.0.

2 July 2012

Captions

Add a one-line explanation of what this file represents

Items portrayed in this file

depicts

11 July 2001

17°41'24.612"S, 149°22'33.625"W

File history

Click on a date/time to view the file as it appeared at that time.

Date/TimeThumbnailDimensionsUserComment
current17:01, 2 July 2012Thumbnail for version as of 17:01, 2 July 2012720 × 480 (137 KB)Dzlinker== {{int:filedesc}} == {{Information |Description=To download the full resolution and other files go to: [http://earthobservatory.nasa.gov/IOTD/view.php?id=78218&src=flickr earthobservatory.nasa.gov/IOTD/view.php?id=78218&src=...] In August 1768, Capt...

The following 3 pages use this file:

Global file usage

The following other wikis use this file:

Metadata