Earthquake with magnitude of Md 2.3 on date 27-02-1999 and time 20:18:38 (Italy) in region 9 km SE Norcia (PG)

A magnitude Md 2.3 earthquake occured in region: 9 km SE Norcia (PG), on

  • 27-02-1999 19:18:38 (UTC)
  • 27-02-1999 20:18:38 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.72, 13.14 at 11 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
Norcia PG 9 4957 4957
Accumoli RI 10 667 5624
Cascia PG 10 3217 8841
Cittareale RI 12 482 9323
Arquata del Tronto AP 14 1178 10501
Amatrice RI 16 2657 13158
Poggiodomo PG 17 117 13275
Monteleone di Spoleto PG 17 599 13874
Castelsantangelo sul Nera MC 19 281 14155
Preci PG 19 724 14879

Municipalities with at least 50000 inhabitants

An earthquake occurred to
44 Km SE of Foligno (57155 inhabitants)
44 Km E of Terni (111501 inhabitants)
46 Km NW of L'Aquila (69753 inhabitants)
47 Km W of Teramo (54892 inhabitants)
75 Km SE of Perugia (166134 inhabitants)
86 Km W of Montesilvano (53738 inhabitants)
87 Km NE of Guidonia Montecelio (88673 inhabitants)
89 Km NE of Tivoli (56533 inhabitants)
91 Km E of Viterbo (67173 inhabitants)
93 Km W of Pescara (121014 inhabitants)
94 Km W of Chieti (51815 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 2.3 1999-02-27
19:18:38
42.72 13.14 11 2013-07-15
08:40:51
Bollettino Sismico Italiano INGV 360329
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1999-02-27 19:18:38 ± 0.59
Latitude 42.72 ± 0.02
Longitude 13.14 ± 0.06
Depth (km) 11 ± 3 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 360329

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) 5200.7
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 234
Number of associated phases, regardless of their use for origin computation 10
Number of defining phases 10
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.4
Epicentral distance of station closest to the epicenter (degree) 0.00097
Epicentral distance of station farthest from the epicenter (degree) 0.00899
Number of stations at which the event was observed 5
Number of stations from which data was used for origin computation 5
Magnitude information

Md:2.3

Field Value
Value 2.3
Uncertainty
Num. used stations 2
Type of magnitude Md
Reference to an origin 360329
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 22:37:53
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
--.FB9.Z. 1999-02-27T19:19:13.19 10.0 undecidable manual SN 344 0.009 0.29 0.4
--.FB9.Z. 1999-02-27T19:18:59.78 10.0 undecidable manual PN 344 0.009 1.3 0.2
--.SNTG.Z. 1999-02-27T19:18:57.68 10.0 undecidable manual SG 344 0.0049 -0.69 0.5
--.ASS.Z. 1999-02-27T19:18:57.19 10.0 undecidable manual SG 313 0.0044 0.71 0.4
--.MNS.Z. 1999-02-27T19:18:55.84 10.0 undecidable manual SG 225 0.0042 -0.13 0.7
--.MNS.Z. 1999-02-27T19:18:48.66 10.0 undecidable manual PG 225 0.0042 -0.05 1.7
--.SNTG.Z. 1999-02-27T19:18:48.65 10.0 undecidable manual PG 344 0.0049 -1.44 0.3
--.ASS.Z. 1999-02-27T19:18:48.85 10.0 undecidable manual PG 313 0.0044 -0.14 1.7
--.NRCA.Z. 1999-02-27T19:18:44.59 10.0 undecidable manual SG 350 0.001 0.13 0.6
--.NRCA.Z. 1999-02-27T19:18:42.10 10.0 negative manual PG 350 0.001 0.05 3.4
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
Download
Type Description Link
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