After an earthquake, know which towns, bridges, dams and hospitals to check first.
Kampana turns an earthquake's magnitude, depth and location into estimated shaking at 276 reference towns, and into an ordered list of public bridges, dams, hydro stations and hospitals to inspect across the Himalaya and the Northeast. It reads USGS and India's National Center for Seismology, shows how uncertain every estimate is, and cites every threshold.
Earthquakes are frequent here. Between 1 January 2016 and 21 October 2026 the USGS catalogue lists 552 earthquakes of magnitude 5 and above between 5 and 38° N and 66 and 98° E, about 51 a year, and 30 of magnitude 6 and above. Many are deep or outside India. The ones that shake Indian towns hardest strike under the hill roads, dams and towns of the Himalaya and the Northeast: Manipur in 2016 (M6.7), Arunachal Pradesh in 2019 (M5.9), Assam in 2021 (M6.0) and Uttarakhand in October 2026 (M5.1).
Loading the catalogue…
Within minutes of a quake, the National Center for Seismology publishes its location and magnitude. What does not exist is the next step: which public structures sat in the strongest shaking, and in what order engineers should reach them. Dam owners must inspect after an earthquake under the National Dam Safety Authority's 2024 regulations (NDSA), and a parliamentary committee asked in August 2026 for denser seismic networks and sturdier communications (Rajya Sabha Committee on Home Affairs, Report 261, paragraphs 4.4.12 to 4.4.14).
- Lists every earthquake of magnitude 3.5 and above in the last 90 days near the Himalaya and the Northeast from USGS, puts the National Center for Seismology's solution beside it, and adds the events only NCS located.
- Estimates the shaking at 276 reference towns with a published equation, gives the likely range, and compares it with USGS ShakeMap wherever one is published.
- For the events most likely to have shaken India, lists public bridges, dams, hydro stations and hospitals inside the area where intensity V is possible, in three inspection tiers, with the national highway length to patrol.
- Gives field checklists for bridges, dams, hospitals, hill roads and towns, summarised from Indian and international guidance with links to each source.
- Shows ten years of seismicity by zone: rates, the largest events, depths and Gutenberg-Richter b-values.
- Estimates any event in the browser from the parameters NCS or USGS report, before the next data refresh.
- LocateUSGS and NCS solutions, paired when they are within 30 s and 100 km of each other.
- EstimateAllen, Wald and Worden (2012) intensity at each town, with the 16th to 84th percentile range.
- ScreenWhere the 84th percentile reaches intensity V; for dams, also the ICOLD screening distance.
- ListPublic assets from OpenStreetMap in three tiers; military and armed-police sites are excluded.
- CheckAgainst USGS ShakeMap where published, with checklists from IRC, NDSA, CWC, ATC, WHO and NDMA.
The browser copy of the equation checks itself against independent verification tables on every visit. Every formula, threshold and known failure mode is in the methods note and on the console's Methods page.
| Source | What | Licence | Status |
|---|---|---|---|
| USGS ComCat | Earthquakes of M3.5 and above for 90 days, M4.5 and above since 2016 | Public domain | Live |
| National Center for Seismology, RISEQ | India's official solutions, about two weeks at a time, kept in a rolling archive | Published by NCS; no licence stated | Live |
| USGS ShakeMap | Shaking grids and contours, used as an independent check | Public domain | Live |
| GDACS | Green, orange and red impact alerts | CC BY 4.0 | Live |
| OpenStreetMap via Overpass | Bridges, dams, hydro stations, hospitals and national highways in India | ODbL 1.0 | Live |
| Published science | Intensity equation (Allen, Wald and Worden 2012), ground-motion conversion (Worden et al. 2012), rupture length (Wells and Coppersmith 1994) | Peer-reviewed papers | Cited |
| Engineering guidance | IRC special publications, NDSA 2024, CWC, ICOLD Bulletin 62, ATC-20-1, WHO Hospital Safety Index, NDMA guidelines | Public documents | Cited |
| Asset owners' registers | Bridge, dam and hospital inventories with design data, to replace OpenStreetMap | Owner data | Wanted |
Nothing in Kampana is simulated. Every estimate is labelled as an estimate, with its source and time.
- Road agencies (BRO, NHIDCL, state public works departments): which bridges and highway stretches to inspect first.
- Dam and hydro owners: which structures sit inside the shaking area or the ICOLD screening distance.
- District and state disaster management authorities: which towns may have felt strong shaking, before reports arrive.
- District health officers and hospital administrators: which hospitals to check for structural and lifeline damage.
- Advisory only. Every page names the National Center for Seismology, NDMA, the state disaster management authority and the asset owner as the authorities to follow.
- Public infrastructure only. Military and armed-police sites are excluded before anything is stored, and Kampana holds no data about people.
- Every estimate shows its likely range, its source and its time. Heuristics, such as the inspection tiers, are labelled as heuristics.
- The method is published, including its checks against independent tables and against USGS ShakeMap.
- Shaking is estimated from magnitude, depth and distance on an average site. Soft soils, ridge tops and long ruptures can shake harder than estimated.
- OpenStreetMap is incomplete in many border districts. An empty list does not mean nothing needs inspection.
- The site refreshes when the pipeline runs. Between runs, the quick estimate works from NCS or USGS parameters.
- NCS's event list shows about two weeks at a time; Kampana's archive of it starts on 6 October 2026.
One state or one road agency for a season: load your bridge, dam and hospital registers in place of OpenStreetMap, connect the NCS feed directly, and rehearse on past earthquakes. contact@trinetra.in