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.

mangalurucity

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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News Network
March 30,2020

Belgaum, Mar 30: As many as 2442 labourers hailing from Karnataka have been brought back in 62 buses by the State government from Maharashtra on Sunday, in the backdrop of nation-wide lockdown following COVID-19 outbreak.

Maharashtra Chief Minister Uddhav Thackeray on Saturday urged migrant labourers not to leave the State owing to the nationwide lockdown and assured that the Maharashtra government will look after their interests.

Hundreds of migrants, a majority of whom are daily wage workers started rushing to their native places from different states amid uncertainty over their livelihood following the announcement of a 21-day nationwide lockdown by Prime Minister Narendra Modi last week in order to contain the spread of novel coronavirus.

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News Network
January 25,2020

Bengaluru, Jan 25: Karnataka Health Minister B Sriramulu on Friday, hit out at JD(S) leader HD Kumaraswamy, accusing the former Chief Minister of pursuing "vote bank" politics and advised him to move to Pakistan.

"It is better to move to Pakistan...if he shows so much love towards Pakistan, why should he live in India? He should not do dual politics like this. He wants to be fair to Pakistan and also to India," Sriramulu said.

Terming it as "double standards", the Minister said: "From so many years, you have been doing vote bank politics. You have to understand one thing...you are the son of former Prime Minister and also a former Chief Minister. By giving these type of statements, I think it will hurt the citizens of India. If you want to do vote bank politics I must suggest that it is better to leave the country."

His statement comes after Kumaraswamy took a jibe at BJP over its "obsession with Pakistan".

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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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