Earthquake with magnitude of Md 2.3 on date 27-02-1999 and time 08:29:40 (Italy) in region 8 km E Norcia (PG)

A magnitude Md 2.3 earthquake occured in region: 8 km E Norcia (PG), on

  • 27-02-1999 07:29:40 (UTC)
  • 27-02-1999 08:29:40 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.78, 13.2 at 15 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 8 4957 4957
Arquata del Tronto AP 8 1178 6135
Accumoli RI 11 667 6802
Castelsantangelo sul Nera MC 13 281 7083
Montegallo AP 13 523 7606
Preci PG 17 724 8330
Cascia PG 17 3217 11547
Montemonaco AP 17 604 12151
Acquasanta Terme AP 18 2916 15067
Ussita MC 18 444 15511
Visso MC 19 1107 16618
Cittareale RI 19 482 17100
Amatrice RI 19 2657 19757

Municipalities with at least 50000 inhabitants

An earthquake occurred to
44 Km W of Teramo (54892 inhabitants)
44 Km E of Foligno (57155 inhabitants)
51 Km NW of L'Aquila (69753 inhabitants)
51 Km E of Terni (111501 inhabitants)
75 Km E of Perugia (166134 inhabitants)
84 Km W of Montesilvano (53738 inhabitants)
91 Km W of Pescara (121014 inhabitants)
93 Km NW of Chieti (51815 inhabitants)
95 Km NE of Guidonia Montecelio (88673 inhabitants)
96 Km S of Ancona (100861 inhabitants)
97 Km NE of Tivoli (56533 inhabitants)
98 Km E of Viterbo (67173 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
07:29:40
42.79 13.2 15 2013-07-15
08:40:51
Bollettino Sismico Italiano INGV 360309
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1999-02-27 07:29:40 ± 0.457
Latitude 42.79 ± 0.01
Longitude 13.20 ± 0.04
Depth (km) 15 ± 2 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 360309

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) 3543
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 245
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) 0.2
Epicentral distance of station closest to the epicenter (degree) 0.00065
Epicentral distance of station farthest from the epicenter (degree) 0.00494
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:2.3

Field Value
Value 2.3
Uncertainty
Num. used stations 3
Type of magnitude Md
Reference to an origin 360309
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 22:37:52
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
--.MNS.Z. 1999-02-27T07:30:00.24 10.0 undecidable manual SG 223 0.0049 -0.11 0.6
--.ASS.Z. 1999-02-27T07:29:58.63 10.0 undecidable manual SG 304 0.0043 0.38 0.2
--.SNTG.Z. 1999-02-27T07:29:58.15 10.0 undecidable manual SG 338 0.0045 -0.73 0
--.MNS.Z. 1999-02-27T07:29:51.86 10.0 undecidable manual PG 223 0.0049 -0.17 1.2
--.SNTG.Z. 1999-02-27T07:29:51.24 10.0 undecidable manual PG 338 0.0045 0.06 1.5
--.ASS.Z. 1999-02-27T07:29:50.94 10.0 undecidable manual PG 304 0.0043 0.12 1.5
--.NRCA.Z. 1999-02-27T07:29:45.94 10.0 undecidable manual SG 308 0.0006 -0.46 0.2
--.NRCA.Z. 1999-02-27T07:29:44.16 10.0 negative manual PG 308 0.0006 0.18 2.8
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
Download
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