You can find acceleration time history data of historical Indian earthquakes from several sources, including government agencies, research institutions, and academic databases. Some of these sources include:
Indian Meteorological Department (IMD): The IMD is the primary agency responsible for monitoring and reporting on earthquakes in India. They may have access to historical acceleration time history data for Indian earthquakes.
National Centre for Seismology (NCS): The NCS is a division of the Ministry of Earth Sciences in India and is responsible for monitoring and analyzing earthquakes in India. They may have access to historical acceleration time history data for Indian earthquakes.
National Geophysical Research Institute (NGRI): The NGRI is a research institute in Hyderabad, India, that studies the Earth's geology, seismology, and natural hazards. They may have access to historical acceleration time history data for Indian earthquakes.
Indian Institute of Technology (IIT) - Roorkee: The IIT in Roorkee, India, is a leading engineering and technology institution in India and has a strong focus on earthquake engineering and seismology. They may have access to historical acceleration time history data for Indian earthquakes.
International Data Centre for Seismology (IDC): The IDC is a global repository for seismic data and may have access to historical acceleration time history data for Indian earthquakes.
You can also check websites of other research institutions in India that specialize in earthquake engineering and seismology for more information.