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M5.7 Chhapri Earthquake, 2011

Date:

4 April 2011

Epicentre:

NW of Athpali, Dharchula

Time:

11:31:41 UTC  

Latitude:

29.678 N (PDE)

Longitude:

80.750 E (PDE)

Depth:

12.5 kms (PDE)

Magnitude:

ML=5.7 (NSC), Mw=5.4 (HRV)

Additional Info


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A moderate earthquake (M5.0 to 5.9 termed as "moderate") occurred in western Nepal near Chhapri along the Nepal-India border on 4 April 2011 at 17:16 PM local time in Nepal and 17:01 PM local time in India. It had a magnitude of ML=5.7 causing some damage in western Nepal and northern India. This is one the largest earthquakes in this immediate region since 2002.

The earthquake was centred 6.8 kms NW of Athpali (Mahakali), Nepal,
28.7 kms SE of Dharchula (Mahakali), Nepal,
36 kms NW of Bajhang (Seti), Nepal,
52.9 kms E of Pitoragarh (Uttarakhand), India,
89 kms NNE of Mahendranagar (Mahakali), Nepal,
107 kms E of Almora (Uttarakhand), India,
316 kms NNW of Lucknow (Uttar Pradesh), India,
363 kms ENE of Connaught Place (Delhi), India,
496 kms NW of Kathmandu, Nepal.

If you felt this earthquake, please take the time to fill out a felt report questionnaire.

Minor damage was reported from northern Baitadi district, Bajhang district and Dharchula district. In Baitadi district, a house collapsed at Mahadevsthan-5 and several others were damaged. At least a dozen buildings were damaged including a building housing the Kalapani FM station in Khalanga and a court house in the Dharchula area in Far-Western Nepal. In Bajhang district at least a dozen building were damaged in Chainpur including one belonging to Radio Seti. This earthquake was felt for close to 32-seconds western Nepal. Landslides and rock falls were reported from different parts of the region. Tremors were also felt in Mid-western Nepal and as far east as Gorkha.

This earthquake felt in several parts of northern India. In Uttarakhand, at least four dozen buildings were damaged in the Kumaon region and a dozen buildings developed minor cracks in the Gharwal region. A primary school collapsed at Suva in the Dharchula area in Kumaon. At least 42 buildings developed cracks in Dharchula. Several buildings in Pitoragarh also developed cracks as did the post office building in Kanar. In Bajpur, loose objects were thrown down and broken. In Kaphalikhan near Almora, old houses developed cracks. Strong tremors caused panic at Bageshwar, Champawat, Chaukhatia, Haridwar, Kiccha, Khatima, Munsiari, Pitoragarh and Rudrapur sending people running outdoors. Elsewhere in the state mild tremors were felt at Dehradun, Dhauladevi, Dineshpur, Doiwala, Dwarahaat, Gadarpur, Jolly Grant, Kashipur, Naini Tal, Ranipohkri, Ranikhet, Rishikesh and Sultanpur Patti. In an isolated incident, minor non-structural damage is reported to have been sustained by an old building on Chakrata Road in Dehradun.

In Uttar Pradesh, a few buildings developed cracks at Bhajani and Rajapur. Strong tremors were felt at Bahedi, Bahraich, Bareilly, Bijnor, Meerut, Moradabad, Muzaffarnagar, Nagina, Raipur, Rajapur, Sethal, Siswadi and Tikunia sending people running outdoors. Elsewhere in the state, the earthquake was felt at Aligarh, Bulandshahr, Chandpur, Dhampur, Ghaziabad, Jyotiba Phule Nagar, Lucknow, Kanpur, Nanpara, Nurpur, NOIDA, Rampur and Saharanpur. The Nuclear Power Corporation of India Limited said the nuclear power plant at Narora in the state was unaffected and was functioning normally.

In Delhi, the earthquake was felt indoors by several people especially those on the upper floors of buildings. Reports of this earthquake from the Delhi-NCR region came in from DLF Gurgaon, Faridabad. Greater Kailash, Govindpuri, NOIDA and Vasant Vihar. In Haryana, mild tremors were felt at Karnal as well as in multi-storied buildings in Faridabad and Gurgaon. Mild tremors were also felt in Jaipur in Rajasthan, in Mohali in Punjab and in the upper floors of buildings in Dharamsala, Kangra and Shimla in Himachal Pradesh as well as in the Union Territory of Chandigarh.

This is the largest earthquake in this general area since 27 November 2001 when two moderate earthquakes struck the region. The largest instrumented earthquake in this region is the Mw=7.2 Byas Rikhi earthquake that occurred on 28 August 1916. It caused damage in the Dharchula region and was widely felt in northern India. The Harvard centroid moment tensor solution for the event on 4 April 2011 indicates the greatest seismic moment release occurred on a thrust fault with a small strike-slip component.

CENTROID-MOMENT-TENSOR  SOLUTION
GCMT EVENT:     C201104041131A 
DATA: II IU CU IC G  GE

L.P.BODY WAVES: 77S, 111C, T= 40
MANTLE WAVES:    8S,   8C, T=125
SURFACE WAVES:  95S, 170C, T= 50
TIMESTAMP:      Q-20110404150426
CENTROID LOCATION:
ORIGIN TIME:      11:31:46.6 0.1
LAT:29.37N 0.01;LON: 80.69E 0.01
DEP: 22.9  0.5;TRIANG HDUR:  1.3
MOMENT TENSOR: SCALE 10**24 D-CM
RR= 1.190 0.026; TT=-1.050 0.019
PP=-0.142 0.022; RT= 1.080 0.038
RP=-0.062 0.035; TP= 0.789 0.017
PRINCIPAL AXES:
1.(T) VAL=  1.661;PLG=65;AZM=340
2.(N)       0.165;    17;    110
3.(P)      -1.827;    18;    206
BEST DBLE.COUPLE:M0= 1.74*10**24
NP1: STRIKE=321;DIP=31;SLIP= 125
NP2: STRIKE=102;DIP=65;SLIP=  71

            -----------           
        --######-----------       
      ###############--------     
    ####################-------   
   #######################------  
  ############   ##########------ 
  ############ T ###########----- 
 -############   ############-----
 ---##########################----
 -----########################----
 ---------#####################---
  -------------################## 
  ----------------------------### 
   ---------------------------##  
    ------   ----------------##   
      ---- P ---------------#     
        --   --------------       
            -----------           

References
01) National Seismological Centre (NSC), Kathmandu, Nepal.
0
2) National Earthquake Information Centre (PDE), Golden, USA.
03) Harvard Centroid Moment Tensor Solution (HRV), Harvard, USA.
04)
Macroseismic information has been compiled by the ASC from reports by local media and local NGO personnel.

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Page Updated: 10 Aug 2011 | Website Disclaimer

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