Earthquake with magnitude of Md 3.1 on date 18-05-1999 and time 23:53:24 (Italy) in region 3 km N Monteleone di Spoleto (PG)

A magnitude Md 3.1 earthquake occured in region: 3 km N Monteleone di Spoleto (PG), on

  • 18-05-1999 21:53:24 (UTC)
  • 18-05-1999 23:53:24 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.68, 12.95 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
Monteleone di Spoleto PG 3 599 599
Poggiodomo PG 4 117 716
Cascia PG 7 3217 3933
Scheggino PG 10 461 4394
Sant'Anatolia di Narco PG 11 564 4958
Vallo di Nera PG 12 364 5322
Leonessa RI 13 2435 7757
Polino TR 14 233 7990
Ferentillo TR 15 1913 9903
Cerreto di Spoleto PG 16 1075 10978
Norcia PG 17 4957 15935
Montefranco TR 17 1276 17211
Spoleto PG 18 38218 55429
Arrone TR 18 2763 58192
Cittareale RI 19 482 58674
Morro Reatino RI 20 373 59047
Rivodutri RI 20 1253 60300

Municipalities with at least 50000 inhabitants

An earthquake occurred to
28 Km E of Terni (111501 inhabitants)
37 Km SE of Foligno (57155 inhabitants)
52 Km NW of L'Aquila (69753 inhabitants)
62 Km W of Teramo (54892 inhabitants)
66 Km SE of Perugia (166134 inhabitants)
75 Km E of Viterbo (67173 inhabitants)
78 Km N of Guidonia Montecelio (88673 inhabitants)
81 Km N of Tivoli (56533 inhabitants)
96 Km NE 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 3.1
ML-VAX 2.0
1999-05-18
21:53:24
42.68 12.95 5 2013-07-15
08:41:04
Bollettino Sismico Italiano INGV 366109
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1999-05-18 21:53:24 ± 0.178
Latitude 42.68 ± 0.01
Longitude 12.95 ± 0.02
Depth (km) 5 (operator assigned)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 366109

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) 2025.3
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 95
Number of associated phases, regardless of their use for origin computation 22
Number of defining phases 22
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.6
Epicentral distance of station closest to the epicenter (degree) 0.0017
Epicentral distance of station farthest from the epicenter (degree) 0.01311
Number of stations at which the event was observed 14
Number of stations from which data was used for origin computation 14
Magnitudes information

Md:3.1

Field Value
Value 3.1
Uncertainty
Num. used stations 5
Type of magnitude Md
Reference to an origin 366109
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 22:43:26

ML:2

Field Value
Value 2
Uncertainty
Num. used stations 9
Type of magnitude ML
Reference to an origin 366109
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
--.FB9.Z. 1999-05-18T21:53:59.93 10.0 undecidable manual SG 353 0.0091 -0.13 0.6
--.RDP.Z. 1999-05-18T21:53:57.90 10.0 undecidable manual SG 190 0.0084 0.43 0.6
--.RMP.Z. 1999-05-18T21:53:55.20 10.0 undecidable manual SG 192 0.0079 -0.84 0.4
--.PLI2.Z. 1999-05-18T21:53:52.30 10.0 undecidable manual PN 144 0.0127 1.29 0.4
--.SFI.Z. 1999-05-18T21:53:52.64 10.0 undecidable manual PN 327 0.0131 1.24 0.4
--.CSNT.Z. 1999-05-18T21:53:52.40 10.0 undecidable manual PN 303 0.013 1.22 0.5
--.PQ9.Z. 1999-05-18T21:53:52.37 10.0 undecidable manual SG 153 0.0066 1.3 0.2
--.RSM.Z. 1999-05-18T21:53:50.48 10.0 undecidable manual PN 344 0.0117 1.31 0.4
--.SDI.Z. 1999-05-18T21:53:47.14 10.0 undecidable manual PN 146 0.0104 -0.15 1.4
--.CRE.Z. 1999-05-18T21:53:47.69 10.0 undecidable manual PN 322 0.0107 0.05 1.4
--.RDP.Z. 1999-05-18T21:53:43.93 10.0 undecidable manual PG 190 0.0084 0.4 1.4
--.FB9.Z. 1999-05-18T21:53:43.59 10.0 undecidable manual PG 353 0.0091 -1.44 0.3
--.RMP.Z. 1999-05-18T21:53:42.37 10.0 undecidable manual PG 192 0.0079 -0.24 1.5
--.AQU.Z. 1999-05-18T21:53:42.43 10.0 undecidable manual SG 134 0.0041 0.05 0.7
--.ASS.Z. 1999-05-18T21:53:40.81 10.0 undecidable manual SG 330 0.0039 -0.64 0.5
--.MNS.Z. 1999-05-18T21:53:38.25 10.0 undecidable manual SG 213 0.0032 -0.05 0.7
--.PQ9.Z. 1999-05-18T21:53:38.33 10.0 undecidable manual PG 153 0.0066 -1.51 0.3
--.AQU.Z. 1999-05-18T21:53:34.10 10.0 undecidable manual PG 134 0.0041 -0.81 1.1
--.ASS.Z. 1999-05-18T21:53:33.62 10.0 positive manual PG 330 0.0039 -0.67 2.3
--.MNS.Z. 1999-05-18T21:53:32.45 10.0 negative manual PG 213 0.0032 -0.01 3.3
--.NRCA.Z. 1999-05-18T21:53:32.90 10.0 undecidable manual SG 38 0.0017 -0.1 0.7
--.NRCA.Z. 1999-05-18T21:53:29.20 10.0 positive manual PG 38 0.0017 0.26 3.2
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
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