Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 2.3 on date 04-02-2016 and time 11:34:38 (UTC) in region 1 km S Velletri (RM)

A magnitude ML 2.3 earthquake occured in region: 1 km S Velletri (RM), on

  • 04-02-2016 11:34:38 (UTC)
  • 04-02-2016 12:34:38 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 41.6740, 12.7750 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
Velletri RM 2 53303 53303
Lanuvio RM 6 13632 66935
Nemi RM 7 1943 68878
Lariano RM 8 13432 82310
Genzano di Roma RM 8 23970 106280
Cisterna di Latina LT 10 36868 143148
Ariccia RM 10 19407 162555
Rocca di Papa RM 11 17034 179589
Albano Laziale RM 11 41715 221304
Cori LT 12 11065 232369
Rocca Massima LT 12 1136 233505
Castel Gandolfo RM 13 8997 242502
Rocca Priora RM 14 11962 254464
Aprilia LT 14 73446 327910
Artena RM 14 14276 342186
Marino RM 14 43026 385212
Monte Compatri RM 15 11978 397190
Labico RM 16 6379 403569
Grottaferrata RM 16 20327 423896
Valmontone RM 17 15959 439855
Monte Porzio Catone RM 17 8693 448548
San Cesareo RM 17 15153 463701
Frascati RM 17 22087 485788
Colonna RM 18 4287 490075
Zagarolo RM 19 17843 507918
Norma LT 19 3946 511864

Municipalities with at least 50000 inhabitants

An earthquake occurred to
2 Km S of Velletri (53303 inhabitants)
14 Km NE of Aprilia (73446 inhabitants)
23 Km E of Pomezia (62966 inhabitants)
25 Km NW of Latina (125985 inhabitants)
28 Km NE of Anzio (54211 inhabitants)
32 Km S of Tivoli (56533 inhabitants)
34 Km SE of Roma (2864731 inhabitants)
37 Km S of Guidonia Montecelio (88673 inhabitants)
46 Km E of Fiumicino (78395 inhabitants)
91 Km SW of L'Aquila (69753 inhabitants)
94 Km SE of Civitavecchia (52991 inhabitants)
99 Km S of Terni (111501 inhabitants)
100 Km SE 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
Bulletin
Rev1000 		ML 2.3 2016-02-04
11:34:38		 41.6745 12.7753 10 2016-05-17
13:17:22		 Bollettino Sismico Italiano INGV 23391001
Reviewed
Rev100 		ML 2.2 2016-02-04
11:34:38		 41.6692 12.7768 9 2016-02-04
11:46:54		 Sala Sismica INGV-Roma 23362061
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2016-02-04 11:34:38 ± 0.07
Latitude 41.6745 ± 0.0045
Longitude 12.7753 ± 0.0060
Depth (km) 10 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 23391001

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 598
Semi-minor axis of confidence ellipse (meter) 342
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 227
Circular confidence region, given by single value of horizontal uncertainty (meter) 600.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 131
Number of associated phases, regardless of their use for origin computation 49
Number of defining phases 32
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.22
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 3.57930
Number of stations at which the event was observed 34
Number of stations from which data was used for origin computation 18
Magnitudes information

ML:2.2

Field Value
Value 2.2
Uncertainty 0.4
Num. used stations 7
Type of magnitude ML
Reference to an origin 23362061
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2016-02-04 11:46:54

ML:2.3

Field Value
Value 2.3
Uncertainty 0.5
Num. used stations 1
Type of magnitude ML
Reference to an origin 23391001
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2016-02-06 11:47:27
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.PETRA.HHZ. 2016-02-04T11:36:40.99 3.0 undecidable manual Sg 13.24 0
IV.MILZ.HHZ. 2016-02-04T11:36:40.99 3.0 undecidable manual Sg 14.94 0
IV.ZONE.HHZ. 2016-02-04T11:36:38.99 3.0 undecidable manual Sn -2.92 0
IV.MCSR.HHZ. 2016-02-04T11:36:36.99 3.0 undecidable manual Sg 6.61 0
IV.SPS2.HHZ. 2016-02-04T11:36:32.99 3.0 undecidable manual Sg 397.3023 14.83 0
IV.TDS.HHZ. 2016-02-04T11:36:23.99 3.0 undecidable manual Sg 10.99 0
IV.CRJA.SHZ. 2016-02-04T11:36:22.99 3.0 undecidable manual Sn -2.71 0
IV.MSSA.HHZ. 2016-02-04T11:36:13.99 3.0 undecidable manual Sn -4.73 0
IV.ZCCA.HHZ. 2016-02-04T11:36:05.99 3.0 undecidable manual Sn 1.6 0
IV.MRVN.HHZ. 2016-02-04T11:36:02.99 3.0 undecidable manual Sg 8.22 0
IV.MCEL.HHZ. 2016-02-04T11:35:54.99 3.0 undecidable manual Sn -0.11 0
IV.SPS2.HHZ. 2016-02-04T11:35:43.28 3.0 negative manual Pg 397.3023 8.73 0
IV.ILLI.HHZ. 2016-02-04T11:35:31.78 3.0 positive manual Pn -3.24 0
IV.FOSV.EHZ. 2016-02-04T11:35:30.99 3.0 undecidable manual Sg 0.5 0
IV.VITU.HNZ. 2016-02-04T11:35:26.99 3.0 undecidable manual S 0.95 0
IV.MOCO.HHZ. 2016-02-04T11:35:09.81 3.0 undecidable manual Pn 0.17 0
IV.PAOL.HHZ. 2016-02-04T11:35:04.93 3.0 undecidable manual P -0.4 0
IV.TOLF.HHN. 2016-02-04T11:35:01.67 0.6 undecidable manual S 304 77.2671 50 0.1 45
IV.VVLD.HHZ. 2016-02-04T11:35:00.71 0.3 undecidable manual S 73 73.371 50 0.17 67
IV.FIAM.HNN. 2016-02-04T11:35:00.17 1.0 undecidable manual S 23 71.5728 50 0.11 23
IV.SRES.HHN. 2016-02-04T11:34:59.04 0.6 undecidable manual S 341 66.0894 50 0.44 43
IV.PTQR.HHZ. 2016-02-04T11:34:57.94 1.0 undecidable manual S 53 64.491 50 -0.21 22
IV.T0110.HHZ. 2016-02-04T11:34:56.21 0.6 undecidable manual P 53 103.0191 50 0.53 39
IV.MODR.HHE. 2016-02-04T11:34:56.44 0.1 undecidable manual P 122 108.9132 50 -0.14 84
IV.GUAR.HHZ. 2016-02-04T11:34:53.31 0.3 undecidable manual S 73 46.4202 50 -0.03 72
IV.GIUL.HHZ. 2016-02-04T11:34:52.56 0.6 undecidable manual S 108 41.8248 50 0.46 44
IV.TOLF.HHN. 2016-02-04T11:34:51.63 0.3 undecidable manual P 304 77.2671 50 -0.08 68
IV.MTCE.HHZ. 2016-02-04T11:34:50.91 1.0 undecidable manual S 356 38.7279 50 -0.38 23
IV.VVLD.HHZ. 2016-02-04T11:34:50.96 0.1 undecidable manual P 73 73.371 50 -0.16 89
IV.FIAM.HNN. 2016-02-04T11:34:50.17 0.6 undecidable manual P 23 71.5728 50 -0.67 39
IV.CERT.HHZ. 2016-02-04T11:34:50.46 0.3 undecidable manual S 29 34.9428 50 0.19 71
IV.SRES.HHN. 2016-02-04T11:34:49.85 0.1 undecidable manual P 341 66.0894 50 -0.14 91
IV.PTQR.HHZ. 2016-02-04T11:34:49.80 0.1 undecidable manual P 53 64.491 50 0.06 93
IV.LATB.EHZ. 2016-02-04T11:34:47.28 0.6 undecidable manual S 142 25.3524 111 -0.41 46
IV.GIUL.HHZ. 2016-02-04T11:34:46.22 0.1 positive manual P 108 41.8248 50 -0.02 97
IV.GUAR.HHZ. 2016-02-04T11:34:46.90 0.1 undecidable manual P 73 46.4202 50 -0.06 96
IV.MTCE.HHZ. 2016-02-04T11:34:45.39 0.1 undecidable manual P 356 38.7279 50 -0.38 91
IV.CERT.HHZ. 2016-02-04T11:34:45.30 0.3 undecidable manual P 29 34.9428 50 0.12 72
IV.ROM9.HNE. 2016-02-04T11:34:44.21 0.3 undecidable manual P 309 27.4503 50 0.18 73
IV.LATB.EHZ. 2016-02-04T11:34:43.63 0.1 positive manual P 142 25.3524 111 -0.06 99
IV.RDP.HHZ. 2016-02-04T11:34:43.17 0.3 undecidable manual S 332 10.4784 133 -0.08 76
IV.MA9.HHE. 2016-02-04T11:34:43.61 0.6 undecidable manual S 318 14.2746 125 -0.67 43
IV.LAV9.HHZ. 2016-02-04T11:34:42.66 0.3 undecidable manual S 273 6.3936 147 0.33 73
IV.VIVA.HHZ. 2016-02-04T11:34:42.67 0.3 undecidable manual S 357 8.3805 140 -0.09 76
IV.SAMA.HHE. 2016-02-04T11:34:42.00 1.0 undecidable manual P 308 19.1697 117 -0.57 22
IV.MA9.HHE. 2016-02-04T11:34:41.60 0.1 undecidable manual P 318 14.2746 125 -0.12 100
IV.VIVA.HHZ. 2016-02-04T11:34:41.12 0.1 undecidable manual P 357 8.3805 140 0.27 98
IV.RDP.HHZ. 2016-02-04T11:34:41.39 0.1 positive manual P 332 10.4784 133 0.26 98
IV.LAV9.HHZ. 2016-02-04T11:34:40.84 0.1 positive manual P 273 6.3936 147 0.24 99
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.VIVA.HHE. ML:3.3 0.02845 0.22 AML other m 2016-02-04T11:34:43.17
TDMT - Time Domain Moment Tensor
Fault Plane solutions in the area
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Type Description Link
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