**Summary:**
This report summarizes the augmentation of the National Seismological Network (NSN) and related activities under the Ministry of Earth Sciences (MoES) since 2014, as of August 6, 2025.
**Key Findings:**
* **National Seismological Network Expansion:** Since the establishment of the National Centre for Seismology (NCS) under MoES in August 2014, the NSN has significantly expanded from 84 stations to 168 operational observatories with real-time data reporting via VSAT.
* **Earthquake Reporting:** The NCS issues monthly earthquake summary reports available on its website (seismo.gov.in) through the "Monthly Report" and "Archive Monthly Report" web pages. Since April 2020, 39 reports of major/significant earthquakes have been issued. Additionally, information on 80,029 earthquakes within the grid of 0-40°N and 60-100°E has been provided to concerned authorities between January 2020 and June 2025.
* **Seismic Microzonation:** The MoES, through NCS, produces seismic microzonation data based on MoES guidelines. As of August 2025, the cities of Delhi, Bengaluru, Kolkata, Guwahati, Jabalpur, Dehradun, Ahmedabad, Gandhidham, and Gangtok have been covered for seismic microzonation. Since 2018, approximately 30 additional cities, including Chennai, Coimbatore, Bhubaneswar, and Mangalore, have been taken up for seismic microzonation. Cities such as Patna, Varanasi, Lucknow, Kanpur, Meerut, Agra, Dhanbad, and Amritsar are in advanced stages of completion. Sundernagar, Una, Palampur, Shimla, Kangra, and Dharamsala in Himachal Pradesh will soon be taken up for seismic microzonation.
Key Entities Referenced
National Seismological Network: A network for monitoring and reporting seismic activity in India.
Ministry of Earth Sciences (MoES): The Indian government ministry responsible for earth science related matters including seismology.
National Centre for Seismology (NCS): An organization under the Ministry of Earth Sciences responsible for monitoring and studying earthquakes.
Delhi: A city in India that has been covered for seismic microzonation.
Bengaluru, Karnataka: A city in Karnataka, India that has been covered for seismic microzonation.
Kolkata, West Bengal: A city in West Bengal, India that has been covered for seismic microzonation.
Guwahati, Assam: A city in Assam, India that has been covered for seismic microzonation.
Himachal Pradesh: A state in India where several cities will be taken up for Seismic Microzonation.
GOVERNMENT OF INDIA
MINISTRY OF EARTH SCIENCES
LOKSABHA
UNSTARRED QUESTION NO. 2983
TO BE ANSWERED ON WEDNESDAY, 6th AUGUST, 2025
NATIONAL SEISMOLOGICAL NETWORK
2983. MS KANGNA RANAUT:
Will the Minister of EARTH SCIENCES be pleased to state:
(a) the augmentation of the National Seismological Network since 2014;
(b) the number of earthquake reports issued by the Government since 2014;
(c) whether the Government has undertaken the process of microzonation of cities;
and
(d) if so, the number of cities so microzoned since 2014, especially in Himachal
Pradesh?
ANSWER
THE MINISTER OF STATE (INDEPENDENT CHARGE)
FOR MINISTRY OF SCIENCE AND TECHNOLOGY
AND EARTH SCIENCES
(DR. JITENDRA SINGH)
(a) Since the establishment of the National Centre for Seismology (NCS) under
Ministry of Earth Sciences (MoES) in August 2014, the national seismic
observatory infrastructure has been significantly expanded. Seismic observatories
increased from about 84 stations in 2014 to 168 operational observatories till date,
with real-time data reporting via VSAT.
(b) The NCS issues monthly earthquake summary reports, available through
“Monthly Report” and “Archive Monthly Report” web pages; these cover every
month on the website of NCS (seismo.gov.in). Based on available data total 39
reports of major/significant earthquakes have been issued since April 2020. These
reports are in addition to information of a total of 80029 earthquakes to concerned
authorities issued in the grid of 0-40oN and 60 -100oE of during January 2020 to
June 2025.
(c) and (d) Seismic Microzonation data is produced by the Ministry of Earth Sciences
(MoES) through National Centre for Seismology (NCS) and is based on
guidelines framed by MoES. The cities of Delhi, Bengaluru, Kolkata, Guwahati,
Jabalpur, Dehradun, Ahmedabad, Gandhidham and Gangtok city of the State of
Sikkim have been covered for seismic microzonation. After that, around 30 cities
have been taken up for seismic microzonation since 2018 onwards. Under this
program cities including Chennai, Coimbatore, Bhubaneswar, and Mangalore are
covered. Additionally, cities such as Patna, Varanasi, Lucknow, Kanpur, Meerut,
Agra, Dhanbad, Amritsar are in advanced stage of completion. Very soon
Sundernagar, Una, Palampur, Shimla, Kangra, Dharamsala from Himachal
Pradesh will be taken up for Seismic Microzonation.
*****