Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.8 on date 06-04-2009 and time 20:45:45 (Italy) in region 6 km NW L'Aquila (AQ)

A magnitude ML 1.8 earthquake occured in region: 6 km NW L'Aquila (AQ), on

  • 06-04-2009 18:45:45 (UTC)
  • 06-04-2009 20:45:45 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.3870, 13.3460 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.

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Municipalities within 20 km from the epicenter

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
L'Aquila AQ 6 69753 69753
Pizzoli AQ 7 4326 74079
Scoppito AQ 8 3727 77806
Barete AQ 9 737 78543
Lucoli AQ 11 1011 79554
Tornimparte AQ 11 3187 82741
Cagnano Amiterno AQ 13 1369 84110
Capitignano AQ 15 665 84775
Ocre AQ 16 1167 85942
Fossa AQ 16 721 86663
Montereale AQ 17 2581 89244
Poggio Picenze AQ 18 1136 90380
Sant'Eusanio Forconese AQ 18 394 90774
Campotosto AQ 19 542 91316

Municipalities with at least 50000 inhabitants

An earthquake occurred to
6 Km NW of L'Aquila (69753 inhabitants)
42 Km SW of Teramo (54892 inhabitants)
61 Km E of Terni (111501 inhabitants)
65 Km NE of Tivoli (56533 inhabitants)
67 Km NE of Guidonia Montecelio (88673 inhabitants)
68 Km W of Montesilvano (53738 inhabitants)
68 Km W of Chieti (51815 inhabitants)
72 Km W of Pescara (121014 inhabitants)
82 Km SE of Foligno (57155 inhabitants)
90 Km NE of Roma (2864731 inhabitants)
91 Km NE of Velletri (53303 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
Bulletin
Rev1000 		ML 1.8 2009-04-06
18:45:45		 42.387 13.346 11 2014-10-21
12:27:13		 Bollettino Sismico Italiano INGV 762029
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2009-04-06 18:45:45 ± 0.11
Latitude 42.3870 ± 0.0045
Longitude 13.3460 ± 0.0097
Depth (km) 11 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-SISPICK
Event type earthquake
Origin ID 762029

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 789
Semi-minor axis of confidence ellipse (meter) 418
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 85
Circular confidence region, given by single value of horizontal uncertainty (meter) 943.4
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 104
Number of associated phases, regardless of their use for origin computation 18
Number of defining phases 17
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.39
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.55848
Number of stations at which the event was observed 11
Number of stations from which data was used for origin computation 10
Magnitude information

ML:1.8

Field Value
Value 1.8
Uncertainty 0.2
Num. used stations
Type of magnitude ML
Reference to an origin 762029
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-05 14:24:44
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.NRCA.SHZ. 2009-04-06T18:46:02.67 0.1 undecidable manual Sg 339 53.0025 0.265 89
IV.PTQR.SHZ. 2009-04-06T18:45:58.72 0.1 undecidable manual Sg 174 40.7259 -0.408 89
IV.VVLD.HHZ. 2009-04-06T18:45:57.56 0.6 undecidable manual Pg 158 61.7937 0.884 36
IV.INTR.HHN. 2009-04-06T18:45:56.79 0.3 undecidable manual Pg 132 61.9935 0.076 69
IV.TERO.HHE. 2009-04-06T18:45:56.74 0.1 undecidable manual Sg 39 33.6441 -0.48 88
IV.NRCA.SHZ. 2009-04-06T18:45:55.58 0.1 undecidable manual Pg 339 53.0025 0.244 90
IV.FAGN.HHE. 2009-04-06T18:45:54.72 0.3 undecidable manual Sg 125 23.6541 0.144 72
IV.FIAM.HHZ. 2009-04-06T18:45:53.98 0.6 undecidable manual Sg 235 22.9548 -0.399 46
IV.PTQR.SHZ. 2009-04-06T18:45:53.27 0.3 undecidable manual Pg 174 40.7259 -0.167 70
IV.VCEL.EHE. 2009-04-06T18:45:53.70 0.1 undecidable manual Pg 89 40.5261 0.296 91
.CAMP.---. 2009-04-06T18:45:52.50 0.3 undecidable manual Sg 17 17.2716 -0.198 72
IV.TERO.HHE. 2009-04-06T18:45:51.98 0.1 undecidable manual Pg 39 33.6441 -0.364 91
IV.FAGN.HHE. 2009-04-06T18:45:51.18 0.1 undecidable manual Pg 125 23.6541 0.368 92
IV.FIAM.HHZ. 2009-04-06T18:45:50.69 0.1 positive manual Pg 235 22.9548 -0.009 99
.CAMP.---. 2009-04-06T18:45:49.84 0.1 undecidable manual Pg 17 17.2716 0.116 98
MN.AQU.HHE. 2009-04-06T18:45:49.61 0.3 undecidable manual Sg 129 5.8941 -0.245 73
MN.AQU.HHE. 2009-04-06T18:45:48.21 0.1 undecidable manual Pg 129 5.8941 0.124 100
IV.FG5.SHZ. 2009-04-06T18:45:44.08 10.0 undecidable manual Pg 0 0 0
TDMT - Time Domain Moment Tensor
Fault Plane solutions in the area
Download
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download