Earthquake with magnitude of Md 2.3 on date 04-05-1999 and time 04:23:44 (Italy) in region 9 km W Accumoli (RI)

A magnitude Md 2.3 earthquake occured in region: 9 km W Accumoli (RI), on

  • 04-05-1999 02:23:44 (UTC)
  • 04-05-1999 04:23:44 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.7, 13.14 at 13 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
Accumoli RI 9 667 667
Cittareale RI 9 482 1149
Cascia PG 10 3217 4366
Norcia PG 11 4957 9323
Amatrice RI 15 2657 11980
Arquata del Tronto AP 15 1178 13158
Monteleone di Spoleto PG 16 599 13757
Poggiodomo PG 17 117 13874
Posta RI 20 694 14568

Municipalities with at least 50000 inhabitants

An earthquake occurred to
43 Km E of Terni (111501 inhabitants)
44 Km NW of L'Aquila (69753 inhabitants)
45 Km SE of Foligno (57155 inhabitants)
47 Km W of Teramo (54892 inhabitants)
76 Km SE of Perugia (166134 inhabitants)
85 Km NE of Guidonia Montecelio (88673 inhabitants)
85 Km W of Montesilvano (53738 inhabitants)
86 Km NE of Tivoli (56533 inhabitants)
90 Km E of Viterbo (67173 inhabitants)
92 Km W of Pescara (121014 inhabitants)
93 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 1999-05-04
02:23:44
42.7 13.14 13 2013-07-15
08:40:51
Bollettino Sismico Italiano INGV 364939
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1999-05-04 02:23:44 ± 0.158
Latitude 42.70 ± 0.01
Longitude 13.14 ± 0.02
Depth (km) 13 ± 2 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 364939

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) 1747.6
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 158
Number of associated phases, regardless of their use for origin computation 12
Number of defining phases 12
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) 0.00113
Epicentral distance of station farthest from the epicenter (degree) 0.00923
Number of stations at which the event was observed 6
Number of stations from which data was used for origin computation 6
Magnitude information

Md:2.3

Field Value
Value 2.3
Uncertainty
Num. used stations 4
Type of magnitude Md
Reference to an origin 364939
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 22:42:18
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
--.FB9.Z. 1999-05-04T02:24:18.41 10.0 undecidable manual SN 345 0.0092 -0.54 0.2
--.FB9.Z. 1999-05-04T02:24:04.75 10.0 undecidable manual PN 345 0.0092 0.28 0.9
--.SNTG.Z. 1999-05-04T02:24:04.69 10.0 undecidable manual SG 345 0.0051 -0.32 0.5
--.ASS.Z. 1999-05-04T02:24:02.77 10.0 undecidable manual SG 315 0.0045 -0.15 0.7
--.MNS.Z. 1999-05-04T02:24:01.21 10.0 undecidable manual SG 226 0.0041 -0.22 0.6
--.AQU.Z. 1999-05-04T02:23:58.90 10.0 undecidable manual SG 150 0.0036 -0.49 0.3
--.SNTG.Z. 1999-05-04T02:23:56.27 10.0 undecidable manual PG 345 0.0051 -0.15 1.6
--.ASS.Z. 1999-05-04T02:23:55.40 10.0 undecidable manual PG 315 0.0045 0.19 1.6
--.MNS.Z. 1999-05-04T02:23:54.39 10.0 undecidable manual PG 226 0.0041 0.03 1.8
--.AQU.Z. 1999-05-04T02:23:53.20 10.0 undecidable manual PG 150 0.0036 0.02 1.8
--.NRCA.Z. 1999-05-04T02:23:50.12 10.0 undecidable manual SG 352 0.0011 -1.16 0
--.NRCA.Z. 1999-05-04T02:23:48.90 10.0 positive manual PG 352 0.0011 0.41 2
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
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