Earthquake with magnitude of Md 2.5 on date 11-09-1999 and time 10:25:45 (Italy) in region 4 km SW Amatrice (RI)

A magnitude Md 2.5 earthquake occured in region: 4 km SW Amatrice (RI), on

  • 11-09-1999 08:25:45 (UTC)
  • 11-09-1999 10:25:45 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.6, 13.26 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
Amatrice RI 4 2657 2657
Montereale AQ 9 2581 5238
Cittareale RI 9 482 5720
Capitignano AQ 9 665 6385
Campotosto AQ 10 542 6927
Accumoli RI 11 667 7594
Borbona RI 14 617 8211
Cagnano Amiterno AQ 16 1369 9580
Posta RI 16 694 10274
Barete AQ 17 737 11011
Pizzoli AQ 18 4326 15337
Crognaleto TE 19 1297 16634
Arquata del Tronto AP 20 1178 17812

Municipalities with at least 50000 inhabitants

An earthquake occurred to
30 Km NW of L'Aquila (69753 inhabitants)
37 Km W of Teramo (54892 inhabitants)
51 Km E of Terni (111501 inhabitants)
60 Km SE of Foligno (57155 inhabitants)
73 Km W of Montesilvano (53738 inhabitants)
79 Km W of Chieti (51815 inhabitants)
79 Km W of Pescara (121014 inhabitants)
80 Km NE of Guidonia Montecelio (88673 inhabitants)
80 Km NE of Tivoli (56533 inhabitants)
91 Km SE of Perugia (166134 inhabitants)
97 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 2.5
ML-VAX 1.5
1999-09-11
08:25:45
42.6 13.26 10 2013-07-15
08:41:04
Bollettino Sismico Italiano INGV 373459
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1999-09-11 08:25:45 ± 0.197
Latitude 42.60 ± 0.01
Longitude 13.26 ± 0.02
Depth (km) 10 (operator assigned)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 373459

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) 1810.2
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 171
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) 0.4
Epicentral distance of station closest to the epicenter (degree) 0.00235
Epicentral distance of station farthest from the epicenter (degree) 0.00834
Number of stations at which the event was observed 4
Number of stations from which data was used for origin computation 4
Magnitudes information

Md:2.5

Field Value
Value 2.5
Uncertainty
Num. used stations 4
Type of magnitude Md
Reference to an origin 373459
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 22:50:34

ML:1.5

Field Value
Value 1.5
Uncertainty
Num. used stations 4
Type of magnitude ML
Reference to an origin 373459
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
--.ARV.Z. 1999-09-11T08:26:17.53 10.0 undecidable manual SG 345 0.0083 0.25 0.6
--.SNTG.Z. 1999-09-11T08:26:09.53 10.0 undecidable manual SG 340 0.0062 -0.29 0.7
--.ARV.Z. 1999-09-11T08:26:04.61 10.0 undecidable manual PG 345 0.0083 0.73 0.6
--.MNS.Z. 1999-09-11T08:26:02.90 10.0 undecidable manual SG 243 0.0043 -0.02 0.9
--.SNTG.Z. 1999-09-11T08:25:58.74 10.0 undecidable manual PG 340 0.0062 -0.83 0.5
--.MNS.Z. 1999-09-11T08:25:55.67 10.0 undecidable manual PG 243 0.0043 0.08 2.2
--.AQU.Z. 1999-09-11T08:25:55.52 10.0 undecidable manual SG 157 0.0023 -0.54 0.5
--.AQU.Z. 1999-09-11T08:25:51.87 10.0 undecidable manual PG 157 0.0023 0.24 2
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
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