Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 2.4 on date 27-04-2015 and time 18:34:30 (UTC) in region 4 km SE Velletri (RM)

A magnitude ML 2.4 earthquake occured in region: 4 km SE Velletri (RM), on

  • 27-04-2015 18:34:30 (UTC)
  • 27-04-2015 20:34:30 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 41.6520, 12.8020 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 4 53303 53303
Cisterna di Latina LT 7 36868 90171
Lanuvio RM 9 13632 103803
Lariano RM 9 13432 117235
Cori LT 9 11065 128300
Rocca Massima LT 10 1136 129436
Nemi RM 11 1943 131379
Genzano di Roma RM 11 23970 155349
Ariccia RM 13 19407 174756
Artena RM 14 14276 189032
Aprilia LT 14 73446 262478
Rocca di Papa RM 15 17034 279512
Albano Laziale RM 15 41715 321227
Norma LT 16 3946 325173
Rocca Priora RM 16 11962 337135
Castel Gandolfo RM 16 8997 346132
Labico RM 17 6379 352511
Valmontone RM 17 15959 368470
Marino RM 18 43026 411496
Monte Compatri RM 18 11978 423474
Grottaferrata RM 19 20327 443801
San Cesareo RM 19 15153 458954
Sermoneta LT 19 9842 468796
Segni RM 19 9159 477955
Colleferro RM 19 21595 499550
Monte Porzio Catone RM 20 8693 508243
Montelanico RM 20 2131 510374
Frascati RM 20 22087 532461

Municipalities with at least 50000 inhabitants

An earthquake occurred to
4 Km SE of Velletri (53303 inhabitants)
14 Km E of Aprilia (73446 inhabitants)
22 Km NW of Latina (125985 inhabitants)
25 Km E of Pomezia (62966 inhabitants)
27 Km NE of Anzio (54211 inhabitants)
35 Km S of Tivoli (56533 inhabitants)
38 Km SE of Roma (2864731 inhabitants)
39 Km S of Guidonia Montecelio (88673 inhabitants)
49 Km E of Fiumicino (78395 inhabitants)
92 Km SW of L'Aquila (69753 inhabitants)
97 Km SE of Civitavecchia (52991 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 2.4 2015-04-27
18:34:30		 41.6523 12.8017 10 2015-10-19
09:28:02		 Bollettino Sismico Italiano INGV 19614481
Reviewed
Rev100 		ML 2.3 2015-04-27
18:34:30		 41.6533 12.8003 10 2015-04-27
18:43:45		 Sala Sismica INGV-Roma 18734621
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2015-04-27 18:34:30 ± 0.08
Latitude 41.6523 ± 0.0045
Longitude 12.8017 ± 0.0072
Depth (km) 10 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 19614481

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 621
Semi-minor axis of confidence ellipse (meter) 382
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 235
Circular confidence region, given by single value of horizontal uncertainty (meter) 620.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 145
Number of associated phases, regardless of their use for origin computation 35
Number of defining phases 35
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.27
Epicentral distance of station closest to the epicenter (degree) 0.08094
Epicentral distance of station farthest from the epicenter (degree) 0.95238
Number of stations at which the event was observed 19
Number of stations from which data was used for origin computation 19
Magnitudes information

ML:2.4

Field Value
Value 2.4
Uncertainty 0.5
Num. used stations 9
Type of magnitude ML
Reference to an origin 19614481
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2015-10-01 11:18:03

ML:2.3

Field Value
Value 2.3
Uncertainty 0.4
Num. used stations 8
Type of magnitude ML
Reference to an origin 18734621
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2015-04-27 18:43:44
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.FIAM.HHZ. 2015-04-27T18:34:53.10 0.6 undecidable manual S 21 73.0713 50 0.23 44
IV.VVLD.HHE. 2015-04-27T18:34:53.00 0.6 undecidable manual S 70 72.1722 50 0.39 42
IV.PTQR.HHE. 2015-04-27T18:34:51.00 0.3 undecidable manual S 50 64.2912 50 0.49 63
IV.MODR.HHZ. 2015-04-27T18:34:48.52 0.3 undecidable manual P 122 105.7164 50 0.05 64
IV.T0110.HHZ. 2015-04-27T18:34:48.70 0.6 undecidable manual P 51 102.8193 50 0.68 36
IV.GUAR.HHZ. 2015-04-27T18:34:45.20 0.3 undecidable manual S 69 45.1215 50 -0.2 69
IV.TOLF.HHE. 2015-04-27T18:34:44.20 1.0 undecidable manual P 305 80.4639 50 -0.38 21
IV.GIUL.HHZ. 2015-04-27T18:34:44.00 0.6 undecidable manual S 105 39.0276 50 0.23 46
IV.MTCE.HHZ. 2015-04-27T18:34:44.00 0.6 undecidable manual S 353 41.4252 50 -0.41 44
IV.VVLD.HHE. 2015-04-27T18:34:43.10 0.1 undecidable manual P 70 72.1722 50 -0.19 88
IV.CERT.HHZ. 2015-04-27T18:34:43.20 0.6 undecidable manual S 24 36.1416 50 0.2 47
IV.FIAM.HHZ. 2015-04-27T18:34:42.97 0.1 undecidable manual P 21 73.0713 50 -0.48 83
IV.ROM9.HHE. 2015-04-27T18:34:42.36 0.6 undecidable manual S 310 30.747 50 0.81 39
IV.PTQR.HHE. 2015-04-27T18:34:42.01 0.3 undecidable manual P 50 64.2912 50 -0.08 69
IV.RCAV.EHZ. 2015-04-27T18:34:40.40 0.3 undecidable manual S 29 24.6531 111 0.64 64
IV.GUAR.HHZ. 2015-04-27T18:34:39.00 0.3 undecidable manual P 69 45.1215 50 -0.13 70
IV.LATB.EHZ. 2015-04-27T18:34:38.70 0.3 undecidable manual S 143 22.0668 113 -0.21 72
IV.MTCE.HHZ. 2015-04-27T18:34:38.01 0.3 undecidable manual P 353 41.4252 50 -0.55 64
IV.GIUL.HHZ. 2015-04-27T18:34:38.02 0.1 undecidable manual P 105 39.0276 50 -0.17 94
IV.SAMA.HHE. 2015-04-27T18:34:38.90 0.6 undecidable manual S 309 22.4553 113 -0.13 49
IV.ROM9.HHE. 2015-04-27T18:34:37.22 0.3 undecidable manual P 310 30.747 50 0.31 69
IV.CERT.HHZ. 2015-04-27T18:34:37.40 0.1 undecidable manual P 24 36.1416 50 -0.35 91
IV.RMP.HHZ. 2015-04-27T18:34:37.90 0.3 undecidable manual S 335 19.4694 116 -0.19 73
IV.MA9.HHZ. 2015-04-27T18:34:37.00 0.3 undecidable manual S 318 17.5713 119 -0.52 68
IV.RDP.HHZ. 2015-04-27T18:34:36.20 0.3 undecidable manual S 329 13.6752 125 -0.17 74
IV.LATB.EHZ. 2015-04-27T18:34:35.43 0.1 undecidable manual P 143 22.0668 113 0.04 99
IV.VIVA.HHZ. 2015-04-27T18:34:35.50 0.3 undecidable manual S 346 11.1777 131 -0.18 74
IV.RCAV.EHZ. 2015-04-27T18:34:35.69 0.1 undecidable manual P 29 24.6531 111 -0.19 96
IV.SAMA.HHE. 2015-04-27T18:34:35.47 0.6 undecidable manual P 309 22.4553 113 0.01 50
IV.LAV9.HNZ. 2015-04-27T18:34:35.40 0.3 undecidable manual S 288 8.9799 137 0.27 73
IV.RMP.HHZ. 2015-04-27T18:34:34.97 0.1 undecidable manual P 335 19.4694 116 0.06 99
IV.MA9.HHZ. 2015-04-27T18:34:34.85 0.3 undecidable manual P 318 17.5713 119 0.27 72
IV.RDP.HHZ. 2015-04-27T18:34:34.13 0.1 undecidable manual P 329 13.6752 125 0.21 97
IV.LAV9.HNZ. 2015-04-27T18:34:33.48 0.1 undecidable manual P 288 8.9799 137 0.28 97
IV.VIVA.HHZ. 2015-04-27T18:34:33.62 0.1 undecidable manual P 346 11.1777 131 0.1 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.CERT.HHN. ML:2.1 0.00046599999999999994 1.02 AML other m 2015-04-27T18:34:45.41
IV.CERT.HHE. ML:2.3 0.0008089999999999999 1.22 AML other m 2015-04-27T18:34:46.42
IV.FIAM.HHN. ML:2.2 0.000244 0.86 AML other m 2015-04-27T18:34:58.47
IV.FIAM.HHE. ML:2.3 0.0003355 0.4 AML other m 2015-04-27T18:34:59.92
IV.GIUL.HHN. ML:2.3 0.00073 0.5 AML other m 2015-04-27T18:34:44.53
IV.GIUL.HHE. ML:2.2 0.0005815 0.56 AML other m 2015-04-27T18:34:44.50
IV.GUAR.HHN. ML:2.6 0.001335 0.2 AML other m 2015-04-27T18:34:46.63
IV.GUAR.HHE. ML:2.5 0.0009390000000000001 1.04 AML other m 2015-04-27T18:34:46.89
IV.LATB.EHE. ML:1.5 0.0002215 0.7 AML other m 2015-04-27T18:34:39.44
IV.LATB.EHN. ML:1.2 0.00010805000000000001 0.76 AML other m 2015-04-27T18:34:43.10
IV.MTCE.HHE. ML:1.8 0.0002045 1.08 AML other m 2015-04-27T18:34:49.26
IV.MTCE.HHN. ML:1.9 0.000253 0.4 AML other m 2015-04-27T18:34:49.39
IV.RDP.HHE. ML:2.8 0.00649 0.58 AML other m 2015-04-27T18:34:38.54
IV.RDP.HHN. ML:3.2 0.018 0.42 AML other m 2015-04-27T18:34:36.94
IV.RMP.HHE. ML:2.8 0.0044 0.86 AML other m 2015-04-27T18:34:40.85
IV.RMP.HHN. ML:2.8 0.005095000000000001 0.32 AML other m 2015-04-27T18:34:40.20
IV.VIVA.HHE. ML:3.4 0.02845 0.36 AML other m 2015-04-27T18:34:38.04
IV.VIVA.HHN. ML:3.6 0.054400000000000004 1.36 AML other m 2015-04-27T18:34:35.92
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
Waveforms Seismic signals in miniseed + resp format Download