Earthquake with magnitude of Md 2.6 on date 17-12-1985 and time 10:13:40 (Italy) in region 3 km SE Spoleto (PG)

A magnitude Md 2.6 earthquake occured in region: 3 km SE Spoleto (PG), on

  • 17-12-1985 09:13:40 (UTC)
  • 17-12-1985 10:13:40 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.71, 12.75 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 3 38218 38218
Scheggino PG 7 461 38679
Sant'Anatolia di Narco PG 7 564 39243
Ferentillo TR 10 1913 41156
Vallo di Nera PG 11 364 41520
Montefranco TR 12 1276 42796
Campello sul Clitunno PG 13 2442 45238
Arrone TR 14 2763 48001
Castel Ritaldi PG 14 3278 51279
Poggiodomo PG 15 117 51396
Polino TR 16 233 51629
Acquasparta TR 17 4778 56407
Monteleone di Spoleto PG 18 599 57006
Cerreto di Spoleto PG 18 1075 58081
Terni TR 19 111501 169582
Trevi PG 19 8469 178051
San Gemini TR 20 5018 183069
Giano dell'Umbria PG 20 3846 186915

Municipalities with at least 50000 inhabitants

An earthquake occurred to
19 Km NE of Terni (111501 inhabitants)
28 Km S of Foligno (57155 inhabitants)
53 Km SE of Perugia (166134 inhabitants)
62 Km NE of Viterbo (67173 inhabitants)
66 Km NW of L'Aquila (69753 inhabitants)
78 Km W of Teramo (54892 inhabitants)
79 Km N of Guidonia Montecelio (88673 inhabitants)
83 Km N of Tivoli (56533 inhabitants)
93 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
Rev 1000 Md 2.6 1985-12-17
09:13:40
42.71 12.75 5 2013-07-15
08:41:04
Bollettino Sismico Italiano INGV 18269
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1985-12-17 09:13:40 ± 0.264
Latitude 42.71 ± 0.01
Longitude 12.75 ± 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 18269

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) 3115.6
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 137
Number of associated phases, regardless of their use for origin computation 14
Number of defining phases 14
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) 0.00291
Epicentral distance of station farthest from the epicenter (degree) 0.01141
Number of stations at which the event was observed 8
Number of stations from which data was used for origin computation 8
Magnitude information

Md:2.6

Field Value
Value 2.6
Uncertainty
Num. used stations 3
Type of magnitude Md
Reference to an origin 18269
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 17:21:02
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
--.AM1.Z. 1985-12-17T09:14:17.92 10.0 undecidable manual SG 36 0.0094 0.92 0.5
--.ARV.Z. 1985-12-17T09:14:10.00 10.0 undecidable manual SG 9 0.0072 0.79 0.6
--.SD1.Z. 1985-12-17T09:14:05.50 10.0 undecidable manual PN 141 0.0114 0.64 0.9
--.AQU.Z. 1985-12-17T09:14:02.00 10.0 undecidable manual SG 126 0.0053 -0.57 0.6
--.AM1.Z. 1985-12-17T09:14:00.42 10.0 undecidable manual PG 36 0.0094 -1.19 0.6
--.ARV.Z. 1985-12-17T09:13:57.00 10.0 undecidable manual PG 9 0.0072 -0.11 1.6
--.PRG.Z. 1985-12-17T09:13:57.00 10.0 undecidable manual SG 326 0.0042 -1.59 0.2
--.ASS.Z. 1985-12-17T09:13:55.50 10.0 undecidable manual SG 348 0.0032 0.89 0.6
--.MNS.Z. 1985-12-17T09:13:54.00 10.0 undecidable manual SG 189 0.0029 0.65 0.8
--.AQU.Z. 1985-12-17T09:13:53.00 10.0 undecidable manual PG 126 0.0053 -0.28 1.7
--.CM2.Z. 1985-12-17T09:13:51.90 10.0 undecidable manual PG 30 0.005 -0.75 1.2
--.PRG.Z. 1985-12-17T09:13:50.00 10.0 undecidable manual PG 326 0.0042 -0.98 1
--.ASS.Z. 1985-12-17T09:13:50.50 10.0 undecidable manual PG 348 0.0032 1.81 0.2
--.MNS.Z. 1985-12-17T09:13:48.00 10.0 positive manual PG 189 0.0029 0.04 3.5
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
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