Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of Md 4.3 on date 04-10-1997 and time 18:13:31 (Italy) in region 5 km NE Sellano (PG)

A magnitude Md 4.3 earthquake occured in region: 5 km NE Sellano (PG), on

  • 04-10-1997 16:13:31 (UTC)
  • 04-10-1997 18:13:31 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.92, 12.98 at 4 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
Sellano PG 5 1079 1079
Preci PG 7 724 1803
Monte Cavallo MC 9 145 1948
Visso MC 9 1107 3055
Cerreto di Spoleto PG 12 1075 4130
Ussita MC 14 444 4574
Castelsantangelo sul Nera MC 15 281 4855
Pieve Torina MC 16 1458 6313
Fiordimonte MC 16 202 6515
Norcia PG 17 4957 11472
Serravalle di Chienti MC 17 1070 12542
Pievebovigliana MC 19 866 13408
Vallo di Nera PG 19 364 13772
Trevi PG 19 8469 22241
Muccia MC 19 915 23156
Campello sul Clitunno PG 19 2442 25598
Fiastra MC 20 559 26157

Municipalities with at least 50000 inhabitants

An earthquake occurred to
23 Km E of Foligno (57155 inhabitants)
48 Km NE of Terni (111501 inhabitants)
52 Km E of Perugia (166134 inhabitants)
66 Km W of Teramo (54892 inhabitants)
72 Km NW of L'Aquila (69753 inhabitants)
90 Km SW of Ancona (100861 inhabitants)
90 Km NE of Viterbo (67173 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 4.3
ML-MEDNET 4.6 		1997-10-04
16:13:31		 42.92 12.98 4 2013-07-15
08:40:51		 Bollettino Sismico Italiano INGV 289489
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1997-10-04 16:13:31 ± 0.246
Latitude 42.92 ± 0.01
Longitude 12.98 ± 0.02
Depth (km) 4 ± 2 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 289489

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) 1567.2
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 153
Number of associated phases, regardless of their use for origin computation 18
Number of defining phases 18
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.3
Epicentral distance of station closest to the epicenter (degree) 0.00243
Epicentral distance of station farthest from the epicenter (degree) 0.02016
Number of stations at which the event was observed 15
Number of stations from which data was used for origin computation 15
Magnitudes information

Md:4.3

Field Value
Value 4.3
Uncertainty
Num. used stations 2
Type of magnitude Md
Reference to an origin 289489
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 21:32:40

ML:4.6

Field Value
Value 4.6
Uncertainty
Num. used stations
Type of magnitude ML
Reference to an origin 289489
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2015-04-28 10:37:17
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
--.GU9.Z. 1997-10-04T16:14:09.96 10.0 undecidable manual PN 310 0.0202 0.74 0.1
--.BDI.Z. 1997-10-04T16:14:06.64 10.0 undecidable manual PN 304 0.0186 -0.19 0.8
--.PII.Z. 1997-10-04T16:14:05.34 10.0 undecidable manual PN 294 0.0176 0.08 0.9
--.SDI.Z. 1997-10-04T16:13:57.40 10.0 undecidable manual PN 152 0.0121 0.39 0.7
--.SFI.Z. 1997-10-04T16:13:56.00 10.0 undecidable manual PN 320 0.0115 -0.01 1.2
--.CSNT.Z. 1997-10-04T16:13:56.98 10.0 undecidable manual PN 294 0.0121 0.07 1.2
--.RDP.Z. 1997-10-04T16:13:54.25 10.0 undecidable manual PN 189 0.0105 -0.27 1
--.RSM.Z. 1997-10-04T16:13:53.86 10.0 undecidable manual PG 339 0.0097 0.65 0.3
--.RMP.Z. 1997-10-04T16:13:53.36 10.0 undecidable manual PN 190 0.01 -0.47 0.6
--.ARV.Z. 1997-10-04T16:13:53.12 10.0 undecidable manual SG 357 0.0052 -0.02 0.6
--.MNS.Z. 1997-10-04T16:13:53.27 10.0 undecidable manual SG 202 0.0051 0.34 0.4
--.CRE.Z. 1997-10-04T16:13:51.50 10.0 undecidable manual PG 313 0.0091 -0.68 0.3
--.PQ9.Z. 1997-10-04T16:13:50.21 10.0 undecidable manual PG 160 0.0085 -0.53 0.5
--.AQU.Z. 1997-10-04T16:13:45.36 10.0 positive manual PG 150 0.0057 0.25 2.2
--.ARV.Z. 1997-10-04T16:13:43.62 10.0 positive manual PG 357 0.0052 -0.34 1.8
--.MNS.Z. 1997-10-04T16:13:43.82 10.0 positive manual PG 202 0.0051 -0.02 2.8
--.ASS.Z. 1997-10-04T16:13:41.82 10.0 undecidable manual SG 301 0.0024 -0.41 0.3
--.ASS.Z. 1997-10-04T16:13:37.85 10.0 negative manual PG 301 0.0024 0.2 2.4
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
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Type Description Link
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QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download