Page 23 - Jabalpur_EQ

Chapter 2 Seismological

Aspects

The Jabalpur earthquake caused general panic and awoke people out of sleep in
Jabalpur city and nearby areas. The earthquake was felt in most parts of Madhya
Pradesh state and adjoining districts of Uttar Pradesh and Maharastra (e.g., Alla-
habad, Kanpur, Lucknow, Bundelkhand, Nagpur, Amarawati, Chandrapur,
Bhandara, Bandhi, Wardha). The epicenter of the earthquake seems to have
occurred along the segment of the Narmada-Son Lineament (Fig. 2-1). The earth-
quake parameters reported by various agencies are listed in Table 2-1. The
revised epicenter (23.083°N; 80.081°E) reported by USGS seems to be most reli
able which is computed from phase data collected from 242 seismological sta-
tions. The epicenter is located about 12 km from Jabalpur city in the South-East
direction. The earthquake has been assigned magnitudes M=6.0, M=5.6 and a
focal depth =36 km. The fault plane solution of earthquake shows a dominant
thrust component along ENE-WSW trending nodal plane with a minor strike slip
component (Table 2-2). The earthquake had negligible foreshock activity but a
sizable aftershock activity. One person from village Garhakota reported hat he
felt a feeble foreshock around 3.00 am in the morning of May 22, 1997.

TABLE 2-1. Parameters of the Jabalpur Earthquake

Agency Epicenter Magnitude Focal Origin Time
Depth
Lat (°N) Long (°E) |M, |Ms (km)
USGS 23.177 80.021 6.1 5.7 32 04:21:28.97

USGS 23.083 80.081 6.0 5.6 36 04:21:28.70
(Revised)

IMD 23.10 80.10 6.0
NGRI 30 km from 5.8
Jabalpur city

Jabalpur Earthquake of May 22, 1997 13