Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of Md 4.0 on date 25-10-1997 and time 05:08:04 (Italy) in region 4 km W Norcia (PG)

A magnitude Md 4.0 earthquake occured in region: 4 km W Norcia (PG), on

  • 25-10-1997 03:08:04 (UTC)
  • 25-10-1997 05:08:04 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.8, 13.05 at 5 km depth.

The earthquake was located by: Bollettino Sismico Italiano INGV.

Search earthquakes: Any within 30 km radius

The values of hypocentral coordinates and magnitude may be revised at a later time as more information becomes available.

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Municipalities within 20 km from the epicenter

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Norcia PG 4 4957 4957
Preci PG 9 724 5681
Cascia PG 9 3217 8898
Cerreto di Spoleto PG 11 1075 9973
Poggiodomo PG 13 117 10090
Castelsantangelo sul Nera MC 14 281 10371
Sellano PG 14 1079 11450
Visso MC 15 1107 12557
Vallo di Nera PG 16 364 12921
Ussita MC 18 444 13365
Monteleone di Spoleto PG 18 599 13964
Sant'Anatolia di Narco PG 19 564 14528

Municipalities with at least 50000 inhabitants

An earthquake occurred to
33 Km SE of Foligno (57155 inhabitants)
42 Km NE of Terni (111501 inhabitants)
56 Km W of Teramo (54892 inhabitants)
58 Km NW of L'Aquila (69753 inhabitants)
64 Km SE of Perugia (166134 inhabitants)
88 Km E of Viterbo (67173 inhabitants)
93 Km N of Guidonia Montecelio (88673 inhabitants)
95 Km N of Tivoli (56533 inhabitants)
96 Km W of Montesilvano (53738 inhabitants)
99 Km SW of Ancona (100861 inhabitants)
Recent and historical Seismicity
Seismic hazard
Shakemap
Felt maps
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Rev 1000 Md 4.0 1997-10-25
03:08:04		 42.8 13.05 5 2013-07-15
08:40:51		 Bollettino Sismico Italiano INGV 305709
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1997-10-25 03:08:04 ± 0.218
Latitude 42.80 ± 0.01
Longitude 13.05 ± 0.02
Depth (km) 5 ± 2 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 305709

Uncertainty

Field Value
Preferred uncertainty description horizontal uncertainty
Semi-major axis of confidence ellipse (meter)
Semi-minor axis of confidence ellipse (meter)
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi)
Circular confidence region, given by single value of horizontal uncertainty (meter) 2209.9
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 84
Number of associated phases, regardless of their use for origin computation 20
Number of defining phases 20
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.5
Epicentral distance of station closest to the epicenter (degree) 0.00049
Epicentral distance of station farthest from the epicenter (degree) 0.01376
Number of stations at which the event was observed 18
Number of stations from which data was used for origin computation 18
Magnitude information

Md:4

Field Value
Value 4
Uncertainty
Num. used stations 4
Type of magnitude Md
Reference to an origin 305709
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 21:47:00
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
--.FB9.Z. 1997-10-25T03:08:36.50 10.0 undecidable manual SG 347 0.0082 -0.59 0.3
--.CPI2.Z. 1997-10-25T03:08:33.79 10.0 undecidable manual PN 141 0.0138 0.98 0.3
--.PLI2.Z. 1997-10-25T03:08:32.87 10.0 undecidable manual PN 149 0.0132 0.93 0.3
--.CSNT.Z. 1997-10-25T03:08:32.58 10.0 undecidable manual PN 298 0.013 0.98 0.3
--.CRVI.Z. 1997-10-25T03:08:32.30 10.0 undecidable manual PN 138 0.0128 0.78 0.4
--.SFI.Z. 1997-10-25T03:08:31.76 10.0 undecidable manual PN 322 0.0126 0.71 0.5
--.ARV.Z. 1997-10-25T03:08:30.50 10.0 undecidable manual SG 353 0.0063 0.17 0.5
--.RSM.Z. 1997-10-25T03:08:29.45 10.0 undecidable manual PN 339 0.0108 1.12 0.2
--.CRE.Z. 1997-10-25T03:08:27.41 10.0 undecidable manual PN 316 0.0103 -0.04 1.1
--.SDI.Z. 1997-10-25T03:08:27.88 10.0 undecidable manual PN 152 0.011 -0.69 0.6
--.RDP.Z. 1997-10-25T03:08:25.63 10.0 undecidable manual PG 193 0.0096 -0.74 0.6
--.RMP.Z. 1997-10-25T03:08:24.78 10.0 undecidable manual PG 194 0.0091 -0.68 0.6
--.FB9.Z. 1997-10-25T03:08:22.84 10.0 negative manual PG 347 0.0082 -0.63 1.4
--.PQ9.Z. 1997-10-25T03:08:20.87 10.0 undecidable manual PG 161 0.0074 -0.86 0.5
--.ARV.Z. 1997-10-25T03:08:19.40 10.0 negative manual PG 353 0.0063 -0.53 1.7
--.MNS.Z. 1997-10-25T03:08:15.98 10.0 positive manual PG 213 0.0045 0.25 2.2
--.AQU.Z. 1997-10-25T03:08:15.76 10.0 negative manual PG 149 0.0046 -0.34 2.1
--.SNTG.Z. 1997-10-25T03:08:14.68 10.0 negative manual PG 350 0.0041 -0.42 1.9
--.ASS.Z. 1997-10-25T03:08:13.80 10.0 negative manual PG 312 0.0035 0.17 2.3
--.NRCA.Z. 1997-10-25T03:08:06.83 10.0 positive manual PG 54 0.0005 0.35 2.1
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
Download
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download