Earthquake with magnitude of Md 3.3 on date 26-07-1997 and time 13:44:04 (Italy) in region 3 km W Spoleto (PG)

A magnitude Md 3.3 earthquake occured in region: 3 km W Spoleto (PG), on

  • 26-07-1997 11:44:04 (UTC)
  • 26-07-1997 13:44:04 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.73, 12.7 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.

Municipalities within 20 km from the epicenter

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Spoleto PG 4 38218 38218
Castel Ritaldi PG 10 3278 41496
Scheggino PG 11 461 41957
Sant'Anatolia di Narco PG 11 564 42521
Campello sul Clitunno PG 12 2442 44963
Acquasparta TR 13 4778 49741
Vallo di Nera PG 14 364 50105
Ferentillo TR 15 1913 52018
Giano dell'Umbria PG 15 3846 55864
Massa Martana PG 15 3770 59634
Montefranco TR 16 1276 60910
Trevi PG 17 8469 69379
Arrone TR 18 2763 72142
San Gemini TR 18 5018 77160
Montefalco PG 18 5679 82839
Montecastrilli TR 19 5022 87861
Poggiodomo PG 20 117 87978
Terni TR 20 111501 199479

Municipalities with at least 50000 inhabitants

An earthquake occurred to
20 Km N of Terni (111501 inhabitants)
25 Km S of Foligno (57155 inhabitants)
49 Km SE of Perugia (166134 inhabitants)
60 Km NE of Viterbo (67173 inhabitants)
72 Km NW of L'Aquila (69753 inhabitants)
82 Km N of Guidonia Montecelio (88673 inhabitants)
83 Km W of Teramo (54892 inhabitants)
86 Km N of Tivoli (56533 inhabitants)
95 Km N of Roma (2864731 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
Bulletin
Rev1000
Md 3.3
ML-VAX 2.4
1997-07-26
11:44:04
42.73 12.7 5 2013-07-15
08:41:04
Bollettino Sismico Italiano INGV 274029
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1997-07-26 11:44:04 ± 0.225
Latitude 42.73 ± 0.01
Longitude 12.70 ± 0.04
Depth (km) 5 (operator assigned)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 274029

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) 3214.3
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 129
Number of associated phases, regardless of their use for origin computation 19
Number of defining phases 19
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.8
Epicentral distance of station closest to the epicenter (degree) 0.00291
Epicentral distance of station farthest from the epicenter (degree) 0.01999
Number of stations at which the event was observed 12
Number of stations from which data was used for origin computation 12
Magnitudes information

Md:3.3

Field Value
Value 3.3
Uncertainty
Num. used stations 4
Type of magnitude Md
Reference to an origin 274029
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 21:18:57

ML:2.4

Field Value
Value 2.4
Uncertainty
Num. used stations 5
Type of magnitude ML
Reference to an origin 274029
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2015-04-28 13:07:13
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
--.BDI.Z. 1997-07-26T11:45:04.30 10.0 undecidable manual SN 311 0.0181 -0.26 0.4
--.SDI.Z. 1997-07-26T11:44:46.47 10.0 undecidable manual SN 140 0.0118 -1.25 0.2
--.GU9.Z. 1997-07-26T11:44:42.75 10.0 undecidable manual PN 317 0.02 0.75 0.8
--.BDI.Z. 1997-07-26T11:44:40.52 10.0 undecidable manual PN 311 0.0181 1.29 0.5
--.RDP.Z. 1997-07-26T11:44:38.75 10.0 undecidable manual SG 179 0.0087 -0.04 0.6
--.PQ9.Z. 1997-07-26T11:44:35.56 10.0 undecidable manual SG 143 0.0079 -0.21 0.6
--.ARV.Z. 1997-07-26T11:44:33.22 10.0 undecidable manual SG 13 0.007 0.49 0.6
--.SDI.Z. 1997-07-26T11:44:31.25 10.0 undecidable manual PN 140 0.0118 1.74 0.4
--.SFI.Z. 1997-07-26T11:44:30.88 10.0 undecidable manual PN 332 0.0119 1.25 0.7
--.RSM.Z. 1997-07-26T11:44:28.29 10.0 undecidable manual PN 351 0.0108 0.23 1.5
--.PQ9.Z. 1997-07-26T11:44:24.29 10.0 negative manual PG 143 0.0079 1.68 1
--.RDP.Z. 1997-07-26T11:44:23.11 10.0 undecidable manual PG 179 0.0087 -1.25 0.7
--.RMP.Z. 1997-07-26T11:44:22.56 10.0 undecidable manual PG 179 0.0083 -0.82 1.1
--.ARV.Z. 1997-07-26T11:44:19.75 10.0 negative manual PG 13 0.007 -1.1 1.7
--.AQU.Z. 1997-07-26T11:44:18.19 10.0 negative manual PG 125 0.0057 -0.01 3.2
--.MNS.Z. 1997-07-26T11:44:18.38 10.0 undecidable manual SG 181 0.0031 0.2 0.7
--.ASS.Z. 1997-07-26T11:44:16.99 10.0 undecidable manual SG 354 0.0029 -0.48 0.6
--.ASS.Z. 1997-07-26T11:44:11.23 10.0 undecidable manual PG 354 0.0029 -0.82 1.1
--.MNS.Z. 1997-07-26T11:44:11.84 10.0 negative manual PG 181 0.0031 -0.61 2.5
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
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