Thompson Sound (New Zealand)
| Thompson Sound | ||
| Geographical location | ||
|
||
| Coordinates | 45 ° 14 ′ S , 166 ° 59 ′ E | |
| Region ISO | NZ-STL | |
| Country : | New Zealand | |
| region | Southland | |
| Sea access | Tasman Sea | |
| Data about the sound | ||
| entrance | 1 320 m wide | |
| length | around 18 km | |
| width | Max. 1.9 km | |
| Coastline | around 46 km | |
| Tributaries | Pandora River , Namu River and numerous larger and smaller creeks and streams (brooks) | |
The Thompson Sound is a fjord to be designated estuary on the South Island of New Zealand .
geography
The approximately 18 km long Thompson Sound is located around 58 km west-northwest of Te Anau on the southwestern part of the west coast of the South Island. The sound , which is formed by the mainland of the Fiordland region and Secretary Island , has a coastline of around 46 km, measures around 1.9 km at its widest point and has two entrances, the sea-side entrance around 1.32 km to the Tasman Sea and the approximately 2.13 km entrance to Pendulo Reach , with the transition to Bradshaw Sound . The mountains surrounding the sound rise to over 1200 m .
About 3 km southwest is the Doubtful Sound and about 7 km northeast of the Nancy Sound .
geology
The Thompson Sound is in the classic sense a fjord that, like all fjords in the southwest of the South Island, was created on the one hand by glacier movements of the last glacial period and on the other hand was formed by the flooding of the valley by rising sea levels. The name sound came from the first European settlers and seafarers who called numerous valleys in the Fiordland region as sounds , a name that is actually only used for the river valleys flooded from the lake side, such as the sounds in the Marlborough Sounds in the north the south island. The seafarers, mostly of English or Welsh origin, did not know any fjords from their homeland and so they used the names they knew for the inlets, which were later no longer corrected.
Thompson Sound earthquake
On November 1, 2000, an earthquake occurred in the Fiordland region , which had its epicenter 3.5 km northeast of the lake-side entrance of Thompson Sound and was therefore called the Thompson Sound earthquake . It had a strength of 6.1 M W and at the time was the last stronger earthquake of a series in the region in 1988 with an earthquake measuring 6.7 M W in the area around Te Anau began. This was followed, apart from numerous smaller quakes, earthquakes in Doubtful Sound with a magnitude of 6.4 M W , on Secretary Island with a magnitude of 6.8 M W and the Thompson Sound earthquake. All of these quakes were directly on the line of the Alpine Fault , a fault that was created by the clash of the Pacific plate and the Australian plate and along which numerous earthquakes occur in the region.
See also
Individual evidence
- ↑ a b c Topo250 maps . Land Information New Zealand , accessed March 3, 2018 .
- ↑ Coordinates and longitudes were partly made using Google Earth Version 7.1.8.3036 on March 3, 2018.
- ^ A b Milford Sound & Doubtful Sound . (PDF 1.1 MB) Destination Fiordland , November 2016, accessed on May 19, 2019 (English).
- ^ Section C The Marlborough Costal Environment . (PDF 3.98 MB) Marlborough District Council , June 2014, p. 34 , accessed on August 31, 2019 .
- ↑ Russell Robinson, Terry Webb, Peter McGinty, Jim Cousins, D. Eberhart-Phillips : The 2000 Thompson Sound earthquake, New Zealand . In: New Zealand Journal of Geology and Geophysics . Volume 46, Issue 3 . Royal Society of New Zealand , 2003, pp. 331–341 , doi : 10.1080 / 00288306.2003.9515013 (English).