Mangaluru prone to earthquakes, says survey

May 6, 2015

Mangaluru, May 6: According to an experts survey, it has been found that buildings in Bejai-Balmatta, Attavar -Hampankatta, have not adhered to IS 1893 : 2002, Part 1, which is the criteria for earthquake resistant design of structures, NITK?Civil Engineering Department Professor D Venkat Reddy said.

He was delivering a talk on ‘Earth, oceans and coastal zone management’, organised by Institution of Engineers (India) local centre an Institution of Valuers Mangalore Branch in Mangaluru.

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The city falls in seismic zone-3 which means that the quakes of intensity six could occur. The buildings could withstand the earthquakes up to five in the Richter scale. As per Indian Standards on Earthquake Engineering, IS1893:1984 criteria for Earthquake Resistant Design of Structures, the country has been categorised into five seismic zones, based on the seismic intensity. IS is about earthquake resistant design of structures and is applicable to buildings, and other structures such as bridges, dams etc. Earthquakes of magnitude of eight take place in zone five. Nethravathi and Gurupur river basins are tectonically active.

As observed in Nepal, the structural failure of buildings have caused more amount of damage. In contrast, the Pashupathinath Temple is intact, though the building in its surrounding have been badly effected, which is due to the difference in structural pattern.

He further said that seismic waves alone are not responsible . Seismic activities take place round the clock. The earthquakes take place due to the sudden failure of strata. As per an estimation, around one thousand take place across the world everyday and three of them could be serious.

A lineament which is a fault in the underlying geological structure and the constructions on these lineaments such as railway tracks, bridges etc could cause more danger. IIS?has established a network system which records the seismic activities and which can even record 0.1 mm change in the crest of the earth. As per the movement of earth plates, a region will be displaced in a span of hundred years.

Comments

Arjun Neil Menezes
 - 
Tuesday, 20 Feb 2018

I'm building a 1story house with slab on load bearing walls instead of the concrete frame structure. Will this be resistant agaianst earthquakes?

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July 19,2020

Mangaluru, Jul 19: Two flights with 346 stranded Kannadigas from Sharjah and Dammam landed at Mangalore International Airport (MIA) on Saturday night.

MIA officials said on Sunday that the chartered flight from Dammam landed with 178 stranded people, while an Air India flight from Sharjah landed with 168 stranded passengers under the 'Vande Bharat Mission'.

All the passengers on their arrival underwent health checkup and were sent for seven days institutional quarantine. They will undergo swab tests during the quarantine period, health officials said.

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February 7,2020

Bengaluru, Feb 7: The Bruhat Bengaluru Mahanagara Palike (BBMP) ordered the destruction of a tilted building in the city after evacuating about 150 people from 35 families in the vicinity, an official said on Thursday.

"The top portion of the building has been destroyed 70 per cent today (Thursday). Later, the destruction contractor will allow machines to be used," Bruhat Bengaluru Mahanagara Palike (BBMP) Yelahanka joint commissioner Ashok said.

Located on Vinayaknagar Street in Hebbal's Kempapura, the five-storey building being used as a hostel for boys got tilted on Wednesday morning, spreading panic in the neighbourhood.

Though the tilted building owned by one Rahul, a jeweller, was a sound structure, Ashok said a neighbour, Babu, hired a JCB excavator to dig deep beside the affected structure to build his own structure.

"Babu not only dug very deep but also damaged the foundation pillar of the tilted building, weakening the structure and leading to its slant," said Ashok.

Babu has been booked and arrested even as the police are on the look-out for the JCB owner and operator.

The titled building erected five floors unauthorisedly and falls into the B Khata category. It was constructed without the civic body's plan, said Ashok. 

A Khata and B Khata denote the two types of khatas that exist under BBMP. Khata is a document which shows a property owner having an account with the municipality to pay taxes. An A Khata denotes that the building owner has paid relevant property taxes and that the building conforms to building bylaws and government rules. A B Khata denotes that the building is in violation of government regulations regarding properties in Bengaluru, even when the civic charges for the property have been cleared by the owner.

"As per procedure, we issue notice, but such constructions are rampant in the city. Under the BBMP jurisdiction, there are 15 lakh B Khata structures," said Ashok.

For all B Khata sites, the civic body does not give any plan and there is no proper control on them, he said.

Ashok said the case to regularise the B Khata buildings to A Khata buildings is currently pending in the Supreme Court.

Luckily, no injury or loss of life has been reported from the tilted building.

The civic body arranged alternative accommodation for the affected families, but most of them chose to stay with their relatives, said Ashok.

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February 8,2020

Mangaluru, Feb 8: A speeding car fell off the newly-inaugurated Pumpwell flyover in the city after jumping the median and ramming into an oncoming car today. 

At least four persons have suffered injuries in the mishap involving a Maruti Alto and a Renault Duster. The condition of two is said to be extremely critical. The other two have suffered minor injuries.

The accident took place when the driver of the speeding Alto which was heading towards Kasaragod from Udupi lost control over his vehicle.

Towards the end of the flyover, car rammed into the divider and then hit the ill-fated Renault Duster which was coming from the opposite direction. The Alto then fell off the bridge. 

The accident caused traffic jam on the highway for some time. The flyover was inaugurated a week ago, after a decade long wait.

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