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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
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