Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.8 on date 08-04-2009 and time 23:50:31 (Italy) in region 2 km NW Ocre (AQ)

A magnitude ML 1.8 earthquake occured in region: 2 km NW Ocre (AQ), on

  • 08-04-2009 21:50:31 (UTC)
  • 08-04-2009 23:50:31 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.2970, 13.4620 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
Ocre AQ 2 1167 1167
Fossa AQ 2 721 1888
Sant'Eusanio Forconese AQ 5 394 2282
Villa Sant'Angelo AQ 7 424 2706
Rocca di Cambio AQ 7 533 3239
Poggio Picenze AQ 7 1136 4375
L'Aquila AQ 8 69753 74128
San Demetrio ne' Vestini AQ 8 1854 75982
Lucoli AQ 10 1011 76993
Fagnano Alto AQ 11 418 77411
Rocca di Mezzo AQ 11 1526 78937
Barisciano AQ 11 1828 80765
Prata d'Ansidonia AQ 12 496 81261
Tornimparte AQ 13 3187 84448
Fontecchio AQ 14 369 84817
San Pio delle Camere AQ 16 661 85478
Santo Stefano di Sessanio AQ 16 111 85589
Tione degli Abruzzi AQ 18 310 85899
Caporciano AQ 18 230 86129
Carapelle Calvisio AQ 18 87 86216
Ovindoli AQ 19 1227 87443
Castelvecchio Calvisio AQ 19 153 87596
Scoppito AQ 19 3727 91323
Calascio AQ 20 137 91460

Municipalities with at least 50000 inhabitants

An earthquake occurred to
8 Km SE of L'Aquila (69753 inhabitants)
45 Km SW of Teramo (54892 inhabitants)
58 Km W of Chieti (51815 inhabitants)
62 Km W of Montesilvano (53738 inhabitants)
65 Km W of Pescara (121014 inhabitants)
66 Km NE of Tivoli (56533 inhabitants)
69 Km E of Guidonia Montecelio (88673 inhabitants)
73 Km E of Terni (111501 inhabitants)
88 Km NE of Velletri (53303 inhabitants)
92 Km E of Roma (2864731 inhabitants)
96 Km SE of Foligno (57155 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 2009-04-08
21:50:31		 42.297 13.462 10 2014-10-21
12:27:13		 Bollettino Sismico Italiano INGV 776149
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2009-04-08 21:50:31 ± 0.05
Latitude 42.2970 ± 0.0036
Longitude 13.4620 ± 0.0036
Depth (km) 10 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-SISPICK
Event type earthquake
Origin ID 776149

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 364
Semi-minor axis of confidence ellipse (meter) 280
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 32
Circular confidence region, given by single value of horizontal uncertainty (meter) 500.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 53
Number of associated phases, regardless of their use for origin computation 30
Number of defining phases 26
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.24
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.78871
Number of stations at which the event was observed 21
Number of stations from which data was used for origin computation 17
Magnitude information

ML:1.8

Field Value
Value 1.8
Uncertainty 0.5
Num. used stations
Type of magnitude ML
Reference to an origin 776149
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-05 14:41:17
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.VVLD.HHE. 2009-04-08T21:50:47.15 0.6 undecidable manual Sg 164 49.2174 -0.188 45
IV.INTR.HHE. 2009-04-08T21:50:47.30 0.6 undecidable manual Sg 131 48.2184 0.225 45
IV.SSY.BHN. 2009-04-08T21:50:46.75 10.0 undecidable manual Pg 0 0 0
IV.FDMO.HHN. 2009-04-08T21:50:46.81 0.6 undecidable manual Pg 340 87.5457 0.233 42
IV.SDI.SHZ. 2009-04-08T21:50:44.33 0.6 undecidable manual Pg 156 71.1732 0.269 43
IV.ASSB.HHE. 2009-04-08T21:50:43.25 10.0 undecidable manual Pg 0 0 0
IV.NRCA.HHE. 2009-04-08T21:50:43.17 0.3 undecidable manual Pg 335 65.9895 -0.081 67
IV.GUAR.HHE. 2009-04-08T21:50:43.76 10.0 undecidable manual Pg 0 0 0
IV.TERO.HHZ. 2009-04-08T21:50:43.88 0.6 undecidable manual Sg 18 37.9287 -0.442 44
IV.CRMI.HHZ. 2009-04-08T21:50:42.02 10.0 undecidable manual Pg 0 0 0
IV.PTQR.SHZ. 2009-04-08T21:50:42.36 0.3 undecidable manual Sg 189 30.9468 -0.093 71
IV.VCEL.EHZ. 2009-04-08T21:50:42.96 0.6 undecidable manual Sg 71 32.8449 -0.005 48
IV.MNS.HHE. 2009-04-08T21:50:42.66 0.3 undecidable manual Pg 279 64.7907 -0.418 63
IV.FIAM.HHZ. 2009-04-08T21:50:41.91 0.3 undecidable manual Sg 264 28.4493 0.106 71
IV.CERT.HHN. 2009-04-08T21:50:41.33 0.6 undecidable manual Pg 226 55.2003 -0.276 44
IV.LNSS.HHE. 2009-04-08T21:50:40.62 0.3 undecidable manual Pg 315 48.4182 0.069 69
IV.VVLD.HHE. 2009-04-08T21:50:40.47 0.3 undecidable manual Pg 164 49.2174 -0.208 67
IV.INTR.HHE. 2009-04-08T21:50:40.54 0.1 undecidable manual Pg 131 48.2184 0.016 94
IV.TERO.HHZ. 2009-04-08T21:50:39.21 0.3 undecidable manual Pg 18 37.9287 0.273 68
IV.VCEL.EHZ. 2009-04-08T21:50:38.33 0.3 undecidable manual Pg 71 32.8449 0.175 70
IV.T0104.EHZ. 2009-04-08T21:50:37.18 0.3 undecidable manual Sg 304 12.2766 0.014 75
IV.FIAM.HHZ. 2009-04-08T21:50:37.65 0.1 undecidable manual Pg 264 28.4493 0.168 94
IV.PTQR.SHZ. 2009-04-08T21:50:37.86 0.1 undecidable manual Pg 189 30.9468 0.003 97
IV.CAMP.HHZ. 2009-04-08T21:50:37.04 0.3 undecidable manual Pg 351 26.8509 -0.186 70
IV.FAGN.HHZ. 2009-04-08T21:50:36.47 0.6 undecidable manual Sg 109 10.5783 -0.246 48
MN.AQU.HHZ. 2009-04-08T21:50:35.73 0.3 undecidable manual Sg 322 7.9809 -0.395 70
IV.T0104.EHZ. 2009-04-08T21:50:35.09 0.1 undecidable manual Pg 304 12.2766 0.29 94
IV.FAGN.HHZ. 2009-04-08T21:50:34.61 0.1 undecidable manual Pg 109 10.5783 0.066 99
MN.AQU.HHZ. 2009-04-08T21:50:34.24 0.1 undecidable manual Pg 322 7.9809 0.041 100
IV.T0108.HLN. 2009-04-08T21:50:34.39 0.3 undecidable manual Pg 301 8.1807 0.164 73
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