Earthquake with magnitude of Md 2.2 on date 21-02-1999 and time 17:51:21 (Italy) in region 2 km NE Monteleone di Spoleto (PG)

A magnitude Md 2.2 earthquake occured in region: 2 km NE Monteleone di Spoleto (PG), on

  • 21-02-1999 16:51:21 (UTC)
  • 21-02-1999 17:51:21 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.66, 12.96 at 10 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 2 599 599
Poggiodomo PG 6 117 716
Cascia PG 7 3217 3933
Leonessa RI 11 2435 6368
Scheggino PG 12 461 6829
Sant'Anatolia di Narco PG 13 564 7393
Polino TR 13 233 7626
Vallo di Nera PG 14 364 7990
Ferentillo TR 15 1913 9903
Cittareale RI 17 482 10385
Cerreto di Spoleto PG 18 1075 11460
Norcia PG 18 4957 16417
Montefranco TR 18 1276 17693
Arrone TR 18 2763 20456
Rivodutri RI 19 1253 21709
Morro Reatino RI 19 373 22082
Posta RI 19 694 22776
Poggio Bustone RI 19 2055 24831

Municipalities with at least 50000 inhabitants

An earthquake occurred to
28 Km E of Terni (111501 inhabitants)
39 Km SE of Foligno (57155 inhabitants)
50 Km NW of L'Aquila (69753 inhabitants)
61 Km W of Teramo (54892 inhabitants)
68 Km SE of Perugia (166134 inhabitants)
76 Km E of Viterbo (67173 inhabitants)
76 Km N of Guidonia Montecelio (88673 inhabitants)
79 Km N of Tivoli (56533 inhabitants)
94 Km NE of Roma (2864731 inhabitants)
99 Km W of Montesilvano (53738 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 2.2 1999-02-21
16:51:21
42.67 12.97 10 2013-07-15
08:41:04
Bollettino Sismico Italiano INGV 359979
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1999-02-21 16:51:21 ± 0.051
Latitude 42.67 ± 0.00
Longitude 12.97 ± 0.01
Depth (km) 10 (operator assigned)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 359979

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) 623.4
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 183
Number of associated phases, regardless of their use for origin computation 8
Number of defining phases 8
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.1
Epicentral distance of station closest to the epicenter (degree) 0.00178
Epicentral distance of station farthest from the epicenter (degree) 0.00526
Number of stations at which the event was observed 4
Number of stations from which data was used for origin computation 4
Magnitude information

Md:2.2

Field Value
Value 2.2
Uncertainty
Num. used stations 4
Type of magnitude Md
Reference to an origin 359979
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 22:37:33
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
--.SNTG.Z. 1999-02-21T16:51:41.86 10.0 undecidable manual SG 358 0.0053 -0.03 0.5
--.ASS.Z. 1999-02-21T16:51:37.63 10.0 undecidable manual SG 330 0.004 -0.04 0.6
--.MNS.Z. 1999-02-21T16:51:34.80 10.0 undecidable manual SG 216 0.0031 -0.11 0.5
--.SNTG.Z. 1999-02-21T16:51:32.84 10.0 undecidable manual PG 358 0.0053 -0.24 0.2
--.ASS.Z. 1999-02-21T16:51:30.84 10.0 undecidable manual PG 330 0.004 0.2 0.5
--.NRCA.Z. 1999-02-21T16:51:29.40 10.0 undecidable manual SG 32 0.0018 0.01 0.7
--.MNS.Z. 1999-02-21T16:51:28.65 10.0 positive manual PG 216 0.0031 0.01 3.5
--.NRCA.Z. 1999-02-21T16:51:25.94 10.0 undecidable manual PG 32 0.0018 0.08 1.4
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
Download
Type Description Link
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