Earthquake with magnitude of Md 3.7 on date 26-07-1997 and time 06:27:56 (Italy) in region 8 km W Spoleto (PG)

A magnitude Md 3.7 earthquake occured in region: 8 km W Spoleto (PG), on

  • 26-07-1997 04:27:56 (UTC)
  • 26-07-1997 06:27:56 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.75, 12.65 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 8 38218 38218
Castel Ritaldi PG 9 3278 41496
Acquasparta TR 10 4778 46274
Massa Martana PG 11 3770 50044
Giano dell'Umbria PG 11 3846 53890
Campello sul Clitunno PG 14 2442 56332
Scheggino PG 16 461 56793
Sant'Anatolia di Narco PG 16 564 57357
Montefalco PG 17 5679 63036
Montecastrilli TR 17 5022 68058
Trevi PG 17 8469 76527
San Gemini TR 17 5018 81545
Vallo di Nera PG 18 364 81909
Ferentillo TR 18 1913 83822
Montefranco TR 19 1276 85098
Gualdo Cattaneo PG 20 6155 91253
Todi PG 20 16851 108104

Municipalities with at least 50000 inhabitants

An earthquake occurred to
21 Km N of Terni (111501 inhabitants)
24 Km S of Foligno (57155 inhabitants)
45 Km SE of Perugia (166134 inhabitants)
57 Km NE of Viterbo (67173 inhabitants)
76 Km NW of L'Aquila (69753 inhabitants)
83 Km N of Guidonia Montecelio (88673 inhabitants)
87 Km W of Teramo (54892 inhabitants)
88 Km N of Tivoli (56533 inhabitants)
96 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 3.7
ML-VAX 2.9
1997-07-26
04:27:56
42.75 12.65 5 2013-07-15
08:41:04
Bollettino Sismico Italiano INGV 273989
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1997-07-26 04:27:56 ± 0.15
Latitude 42.75 ± 0.01
Longitude 12.65 ± 0.03
Depth (km) 5 (operator assigned)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 273989

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) 2312.1
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 118
Number of associated phases, regardless of their use for origin computation 40
Number of defining phases 40
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.7
Epicentral distance of station closest to the epicenter (degree) 0.00283
Epicentral distance of station farthest from the epicenter (degree) 0.04387
Number of stations at which the event was observed 28
Number of stations from which data was used for origin computation 28
Magnitudes information

Md:3.7

Field Value
Value 3.7
Uncertainty
Num. used stations 4
Type of magnitude Md
Reference to an origin 273989
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 21:18:54

ML:2.9

Field Value
Value 2.9
Uncertainty
Num. used stations 14
Type of magnitude ML
Reference to an origin 273989
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
--.CTI.Z. 1997-07-26T04:29:30.18 10.0 undecidable manual SN 348 0.0304 1.45 0.2
--.BNI.Z. 1997-07-26T04:29:11.65 10.0 undecidable manual PN 300 0.0439 1.23 0.5
--.DOI.Z. 1997-07-26T04:29:02.21 10.0 undecidable manual PN 296 0.0385 -0.08 1.3
--.VAI.Z. 1997-07-26T04:29:01.94 10.0 undecidable manual PN 319 0.0375 1.19 0.5
--.GU9.Z. 1997-07-26T04:29:00.30 10.0 undecidable manual SN 317 0.0197 -0.24 0.8
--.BR9.Z. 1997-07-26T04:29:00.26 10.0 undecidable manual PN 337 0.0365 1 0.7
--.BDI.Z. 1997-07-26T04:28:54.53 10.0 undecidable manual SN 312 0.0178 -1.17 0.3
--.PTCC.Z. 1997-07-26T04:28:53.94 10.0 undecidable manual PN 7 0.0332 -0.21 1.4
--.CKI.Z. 1997-07-26T04:28:52.20 10.0 undecidable manual PN 299 0.0321 -0.39 1.3
--.CTI.Z. 1997-07-26T04:28:50.10 10.0 undecidable manual PN 348 0.0304 0.29 1.5
--.VVI.Z. 1997-07-26T04:28:47.82 10.0 undecidable manual PN 357 0.0291 -0.1 1.6
--.SAL.Z. 1997-07-26T04:28:47.36 10.0 undecidable manual PN 332 0.0291 -0.57 1.3
--.BOB.Z. 1997-07-26T04:28:46.79 10.0 undecidable manual PN 312 0.0275 1.2 0.7
--.TRI.Z. 1997-07-26T04:28:45.62 10.0 undecidable manual PN 14 0.0275 0.04 1.6
--.SDI.Z. 1997-07-26T04:28:41.56 10.0 undecidable manual SN 139 0.0121 1 0.4
--.SFI.Z. 1997-07-26T04:28:39.97 10.0 undecidable manual SN 333 0.0116 0.71 0.6
--.CSNT.Z. 1997-07-26T04:28:37.69 10.0 undecidable manual SN 306 0.011 0.05 0.8
--.RSM.Z. 1997-07-26T04:28:36.90 10.0 undecidable manual SN 353 0.0107 -0.69 0.6
--.EB9.Z. 1997-07-26T04:28:36.90 10.0 undecidable manual PN 316 0.0209 0.68 1.4
--.GU9.Z. 1997-07-26T04:28:33.74 10.0 undecidable manual PN 317 0.0197 0.2 1.9
--.ZC9.Z. 1997-07-26T04:28:32.16 10.0 undecidable manual PN 323 0.0181 1.1 1
--.RDP.Z. 1997-07-26T04:28:31.99 10.0 undecidable manual SG 176 0.0089 0.69 0.6
--.BDI.Z. 1997-07-26T04:28:30.96 10.0 undecidable manual PN 312 0.0178 0.21 2
--.RMP.Z. 1997-07-26T04:28:30.50 10.0 undecidable manual SG 177 0.0084 0.91 0.5
--.PII.Z. 1997-07-26T04:28:27.44 10.0 undecidable manual PN 302 0.0164 -1.12 0.9
--.ARV.Z. 1997-07-26T04:28:25.00 10.0 undecidable manual SG 16 0.007 0.38 0.8
--.SDI.Z. 1997-07-26T04:28:23.68 10.0 undecidable manual PN 139 0.0121 1.67 0.4
--.BS9.Z. 1997-07-26T04:28:23.90 10.0 undecidable manual PN 345 0.0142 -1.42 0.6
--.SFI.Z. 1997-07-26T04:28:20.40 10.0 undecidable manual PN 333 0.0116 -1.21 0.8
--.RSM.Z. 1997-07-26T04:28:20.89 10.0 undecidable manual PN 353 0.0107 1.07 1
--.CSNT.Z. 1997-07-26T04:28:18.79 10.0 undecidable manual PN 306 0.011 -1.53 0.5
--.RMP.Z. 1997-07-26T04:28:15.13 10.0 undecidable manual PG 177 0.0084 -0.54 1.7
--.RDP.Z. 1997-07-26T04:28:15.60 10.0 undecidable manual PG 176 0.0089 -1.06 1
--.PQ9.Z. 1997-07-26T04:28:15.78 10.0 undecidable manual PG 142 0.0082 0.53 1.7
--.ARV.Z. 1997-07-26T04:28:11.77 10.0 undecidable manual PG 16 0.007 -1.03 1.1
--.AQU.Z. 1997-07-26T04:28:10.19 10.0 undecidable manual PG 124 0.0061 -0.75 1.5
--.MNS.Z. 1997-07-26T04:28:10.43 10.0 undecidable manual SG 175 0.0032 -0.33 0.8
--.ASS.Z. 1997-07-26T04:28:08.13 10.0 undecidable manual SG 0 0.0028 -0.78 0.6
--.MNS.Z. 1997-07-26T04:28:03.88 10.0 undecidable manual PG 175 0.0032 -0.92 1.2
--.ASS.Z. 1997-07-26T04:28:03.47 10.0 undecidable manual PG 0 0.0028 -0.26 2
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
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