History of vulnerability of the state to the disasters of different types

The State is prone to disasters like earthquakes, floods, storms, etc. The State witnessed major earthquakes in 1941, 1947, 1950, and a number of subsequent earthquakes thereafter. Floods, Flashflood, Fire, Landslides, Mudslide, Erosions, Hailstones, Heavy Snowfall and High-Speed wind /thunderstorm damages are recurrent phenomena. The State has witnessed major floods and flash floods in the year 1961, 1994, 2001, 2004, 2008, 2014, and flood/ flash floods are now becoming a regular annual phenomenon.

The State of Arunachal Pradesh is in the high rainfall zones of the world where it receives 2500-3000mm average annually. The Floods and landslides in the state are largely due to the prevailing hydro-metrological, geomorphologic, and topographical features added by diminishing forest cover and it results in erosion of fertile agriculture/ horticulture fields.
Apart from this, the entire state is categorized under highly active seismic zone V. The state experiences tremors of minor magnitude every now and then, which results in loosening of soil and occurrence of gaps in the hilly slopes and triggers landslide during rains.

Major Earthquakes in Arunachal Pradesh

YearMagnitude in Richter Scale

Loss of lives due to Fire, Landslide / Flashflood / Flood

SL.NO Date PlaceLoss
11 July 1993Itanagar25 people buried alive
22005Itanagar8 lives lost
3st May 2009Naharlagun4 lives lost
42010State44 lives lost
52011State47 lives lost
62012State70 lives lost
72013State52 lives lost
82014State61 lives lost
92015State29 lives lost
102016State42 lives lost
122017State60 lives lost
132018State7 lives lost

Hazards and their Seasonality

1Flood/ Flash flood April to October
2Landslides March to October 3
3Cyclone/High-Speed wind December to May
4EarthquakeAny time of the year
5Drought Subsequent to monsoon failure(to be notified as and when required by the Department of Agriculture)
6Epidemics Any time of the year and especially during the monsoon period
7Fire Any time of the year but maximum during winter and dry spell

Hazards and their Seasonality

SL.NODistrictsVulnerability to EarthquakeVulnerability to Flood / Flash FloodVulnerability to landslideVulnerability to Fire/ Forest Fire
1TawangVery HighVery HighVery HighHigh
2West KamengVery HighVery HighVery HighHigh
3East KamengVery HighVery HighVery HighHigh
4Papum Pare
Very High
Very High
Very High
Very High
Very High
Very High
5Lower SubansiriVery HighVery HighVery HighHigh
6Kurung KumeyVery HighVery HighVery HighHigh
7Upper SubansiriVery HighVery HighVery HighVery High
8West SiangVery HighVery HighVery HighHigh
9Upper SiangVery HighVery HighVery HighHigh
10East SiangVery HighVery HighVery HighHigh
11SiangVery HighVery HighVery HighHigh
12Lower Dibang ValleyVery HighVery HighVery HighHigh
13Dibang ValleyVery HighVery HighVery HighHigh
14LohitVery HighVery HighVery HighHigh
15NamsaiVery HighVery HighVery HighHigh
16AnjawVery HighVery HighVery HighHigh
17TirapVery HighVery HighVery HighHigh
18ChanglangVery HighVery HighVery HighHigh
19LongdingVery HighVery HighVery HighHigh
20Kra-DaadiVery HighVery HighVery HighHigh
21Lower SiangVery HighVery HighVery HighHigh
22Shi YomiVery HighVery HighVery HighHigh
23Pakke-KesangVery HighVery HighVery HighHigh
24LeparadaVery HighVery HighVery HighHigh