Showing posts with label coastal india. Show all posts
Showing posts with label coastal india. Show all posts

Thursday, September 20, 2018

CONTINENTAL DRIFT ..................



EARTH QUAKES, TSUNAMIS AND CONTINENTAL DRIFT

N.Nandhivarman



Tsunami hit Pondicherry recently and people were taken aback at its ferocity. The least expected unfolding of the Nature’s fury has stirred a debate on the changes in our coastline. Why did it happen and how it happened are subjects of current debate. Earth’s surface rests divided into 12 plates. Now the 13 th plate is in the offing. Throughout history scientists believe continents to be drifting, moving closer, or breaking from one another. Pangaea, the most recent super-continent on Earth began to break 160 million years ago. Paul Hoffman, Professor of Geology at Harvard University opines that while Pangaea broke up the Atlantic Ocean opened splitting North America from Eurasia. Then North America parted from Eurasia subsequently South America from Africa, Australia, Antarctica and India separated from Africa creating the Indian Ocean. The same scholar says, “ Atlantic and Indian Oceans continue to widen while Pacific gets smaller. In 100 million years North America and Asia will probably drift into each other”. Paul Hoffman had already named the new super-continent as Amasia.





Jeffrey Welssel at Columbia University’s Lamont-Doherty Earth Observatory says, “ The result of this crucial stage in the collision between India and Asia is the breakup of the Indo Australian Plate into separate Indian and Australian plates”. He also said “ In The Central Indian Ocean Nature is conducting a large scale experiment for us, showing us what happens to oceanic lithosphere (earth’s outer layer) when a force is applied.” This experiment had its repercussions, when on fault lines earthquakes hit almost exactly where Indo Australian plates have broken.

 Group of researchers from NASA’s Goddard Space Flight Center have provided with schematic global tectonic activity map, which shows several types of faults, active spreading centers, and volcanoes. The fault-lines or geo fractures are areas where we must watch and take all precautions in constructions to save lives.

This may be a global watch, but Pondicherrian’s have specific areas to observe. A Report on Ground Water Survey and Exploration in the Union Territory of Pondicherry and its environs by a team of experts from Central Ground Water Board, Southern region in March 1973 says that “ The photo-geological study has also confirmed the existence of the fault to the west of the coastline a straight scarp running almost parallel to Pondicherry- Markanam Road” That finding was made three decades ago.

 Dr.S.M.Ramasamy Director of Center for Remote Sensing of Bharathidasan University as early as 1993 said, “ The East North East- West South West trending faults on the contrary are showing left handed (sinistrel) ongoing translational movements. Such sinisterly and dextrally moving faults display definite morph tectonic anomalies in the remotely sensed data and also in the field. In addition, there is a conspicuous land subsidence between Pondicherry in the North East and Cumbum valley in the South West.

 One such graben has been established along north east- southwest trending faults in between Pondicherry-Cuddalore in the northeast and Cumbum valley in the Southwest. It is significant to observe that the earthquake epicenters fall along such NE-SW trending fault in Cuddalore, Ariyalor, Dindigul and Kodaikanal.

 In view of a geo-fracture i.e. fault line from Kalapet in Pondicherry to Cumbum Valley in South Tamil Nadu, great caution must be taken in construction of high rise structures wherever fault lines have been identified. Earthquake resistant construction design in places where one fault line passes, as mentioned above, is need of the hour. There are pictures taken by satellites using remote sensing techniques had identified studies covering Tamil Nadu its and various fault lines. It is high time sky scrappers do not come up in the fault line and quake prone areas.

 While Earthquake precautions are need of the hour, the new threat to Tamil Nadu’s coast comes by way of Tsunamis. Tsunami is a known phenomenon in Pacific Ocean stretching from Chile in Latin America to Japan in Far East Asia. Seismic disturbances, coastal earthquakes, volcanic eruptions or under sea landslides that jolt the ocean floor cause tsunamis, which travels at speeds up to 500 miles per hour and reaches heights between 50 and 100 feet. Tsunami observatories and Earth Quake observatories must be set up for early warning systems. People living in low-lying coastal areas have faced the brunt. “ It is high time fishermen settlements are shifted to higher grounds. World Bank and global assistance that is forthcoming must be utilized to create fishermen colonies in high ground ’’opines Narambai Kanagasabai, President of Narambai Fishermen Panchayat of Pondicherry state.

 The green house effect causes rise in sea water levels. Scientists have predicted that by 2100 A.D the rise in sea level will be between 0.5 to 1.5 meters. Before 1.5 million years Sea was closer to Madurai and before 90,000 years Chennai, Pondicherry and Vedaranyam were surrounded by sea. Due to fall in sea levels 65,000 years ago India and Ceylon joined and when sea level rose around 27,000 years ago they parted. Then 17,000 years ago due to fall in water level both joined and when water rose they parted. This is the study-report of Bharathidasan University’s Earth Sciences Department. All these studies and past history makes it clear that our coastline had undergone changes over centuries. Poompuhar of Chola Empire is beneath the seas. Sirkazhi once a coastal town is now an interior town. So changes in our coast is continuous. Caution must be taken about all dwellings in our coast, and let this tsunami attack be an eye opener.


courtesy: The New Indian Express-weekend-1.01.2005


Friday, October 2, 2015

Hygienic Fish Markets : Fashion of the Day

Nellore Fish Market, Andhra Pradesh, India

Hygienic Fish Markets : Fashion of the Day

 The wind of globalization is introducing new concepts like air-conditioned vegetable and fish markets by private parties providing jobs to entrepreneurial youth. At the same time we have Pondicherry’s over crowded   Main market, a place you have to plough your way in a stream of sweat and foul smell. Ever increasing garbage accumulation poses problems for municipal sanitary workers who toil tirelessly to keep market surroundings clean. The lorries that bring the daily requirements for market and small vehicles that bring fish struggle to catch space with consumers who in a haste to park as they please in the entrances of the market. This is a scene of chaos with increase in population. In Pondicherry region we have fish markets in Pondicherry, Muthialpet, Ariyankuppam, Nellithoppu, Madukarai and Villiyanur and temporary markets have sprung up in roadsides at many sub urban places. Nowadays people are looking for hygiene in every aspect of life and consumer awareness is at its peak. Further the perishable products must be sold in haste thereby fish vendors loose their revenue. The setting up of cost price shops by private parties and cooperative institutions too jumping into that bandwagon not to be left behind is a telling tale of our times. Vegetable stalls that offer fresh vegetables in air-conditioned surroundings have cropped up. Chickens and Mutton are sold in shops making it easy for people to buy at various places. But in spite of all this the fish market, vegetable market, flower market and small shops that sell from provisions to brooms are within a limited space of the main market restricted by various constraints making it impossible to expand.

 In such scenario a new Air Conditioned Fish for You shop set by an enterprising young educated youth K.Ponnambalam of Vanarapet, that has come up at the beginning of the Mahatma Gandhi Road near Railway station is refreshing experiment breaking from past.

A student from nearby Veerampattinam fisher-men village of Pondicherry, P.Saravanane who is the 4 th son of a traditional fisherman, doing his second year in doctorate in fish pathology at the Stirling University of Scotland U.K having completed his M.FSc. (Master of Fisheries Science) at Central Marine Fisheries Research Institute Cochin on his visit to his home felt that fish markets here must be improved to make it places of hygiene in order to attract better prices for fish apart from consumer convenience and comfort of buying in a cleaner environment.

To wash sands and filth in the fish catches that comes to market, P.Saravanane suggests setting up of a one-ton capacity of filtering steel tank at the entrance of the market. Immediately after washing fresh icing must be done for the preservation. The fish market should be completely closed and centrally air conditioned for maintaining low temperature, which can reduce the quick spoilage of fish. Hygienic and decent dressing for the fish vendors encouraged. Separate cabins with a washable fish-displaying table should be constructed for selling the fish and be provided with a clear drainage channel, which eventually leads to a common drainage canal. Display table must have fiberglass doors so that fishes can be displayed on an ice layer in the glass cabinet. Each cabin must be given separate pipe connections for easy and quick washing of cabin before and after selling. A hygienic and eco-friendly bag for packing the fish be introduced. There should be a high capacity and quality flake ice machine inside the market for preserving the fish and also for the display unit. Definite control measures should be taken for fly and other insects. Its also wise to have a cold storage room with two different temperature like 4°c and -20°c with clear racks and boxes for short time and long time storage of fish respectively. The market should also be provided with two doors each one for entry and exit. A separate fish cleaning room should be constructed with same facility like fish selling area with a washable table with the provision of tap water pipe connection for each fish dresser. Use of clean stainless steel knife and other fish cutting instruments be encouraged. There should be an exit in the fish dressing room so that the customers can directly exit the market, says P.Saravanane who wants to see his hometown and its markets improve to reach the western standards at least stage by stage.

Fish lovers are braving all ordeals in fish markets to buy their choice and scared housewives wait for street vendors to bring fish to their doors. Let us make their life not only less miserable but make it pleasant to both sellers and buyers. Let Fish woman who carry head-loads of fish and are frowned upon regain their self respect and dignity in pursuing their marketing with changing needs of our times. Fish is wealth and not filth that comes to markets. Let planners plan ultra modern fish markets, while private stalls come up every where to cater the needs of growing population conscious of cleaner environment.
courtesy :

The New Indian Express 28.08.2004

After reading this in New Indian Express then Local Administration Secretary S.Hemachandiran I.A.S called N.Nandhivarman and P.Saravanane for discussion and initiated steps to modernize Ponducherry Fishing Markets....