Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.4 on date 25-10-2013 and time 21:45:06 (UTC) in region 1 km NW Velletri (RM)

A magnitude ML 1.4 earthquake occured in region: 1 km NW Velletri (RM), on

  • 25-10-2013 21:45:06 (UTC)
  • 25-10-2013 23:45:06 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 41.6990, 12.7710 at 12 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 1 53303 53303
Nemi RM 5 1943 55246
Lanuvio RM 6 13632 68878
Lariano RM 6 13432 82310
Genzano di Roma RM 7 23970 106280
Ariccia RM 9 19407 125687
Rocca di Papa RM 9 17034 142721
Albano Laziale RM 10 41715 184436
Rocca Priora RM 11 11962 196398
Castel Gandolfo RM 11 8997 205395
Marino RM 12 43026 248421
Cisterna di Latina LT 13 36868 285289
Monte Compatri RM 13 11978 297267
Rocca Massima LT 13 1136 298403
Artena RM 13 14276 312679
Grottaferrata RM 13 20327 333006
Cori LT 13 11065 344071
Labico RM 14 6379 350450
Monte Porzio Catone RM 14 8693 359143
San Cesareo RM 14 15153 374296
Frascati RM 14 22087 396383
Valmontone RM 15 15959 412342
Colonna RM 15 4287 416629
Aprilia LT 15 73446 490075
Zagarolo RM 17 17843 507918
Ciampino RM 18 38412 546330
Palestrina RM 19 21672 568002
Cave RM 19 11287 579289
Castel San Pietro Romano RM 20 902 580191
Gallicano nel Lazio RM 20 6334 586525
Colleferro RM 20 21595 608120

Municipalities with at least 50000 inhabitants

An earthquake occurred to
1 Km NW of Velletri (53303 inhabitants)
15 Km NE of Aprilia (73446 inhabitants)
23 Km E of Pomezia (62966 inhabitants)
28 Km NW of Latina (125985 inhabitants)
30 Km S of Tivoli (56533 inhabitants)
30 Km NE of Anzio (54211 inhabitants)
32 Km SE of Roma (2864731 inhabitants)
34 Km S of Guidonia Montecelio (88673 inhabitants)
45 Km E of Fiumicino (78395 inhabitants)
89 Km SW of L'Aquila (69753 inhabitants)
92 Km E of Civitavecchia (52991 inhabitants)
97 Km S of Terni (111501 inhabitants)
97 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 1.4 2013-10-25
21:45:06		 41.6988 12.7713 12 2015-01-20
11:29:31		 Bollettino Sismico Italiano INGV 5615091
Reviewed
Rev100 		ML 1.4 2013-10-25
21:45:06		 41.7067 12.7603 15 2014-10-21
12:08:56		 Sala Sismica INGV-Roma 4740491
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2013-10-25 21:45:06 ± 0.1
Latitude 41.6988 ± 0.0045
Longitude 12.7713 ± 0.0060
Depth (km) 12 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 5615091

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 480
Semi-minor axis of confidence ellipse (meter) 362
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 44
Circular confidence region, given by single value of horizontal uncertainty (meter) 480.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 166
Number of associated phases, regardless of their use for origin computation 16
Number of defining phases 16
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.16
Epicentral distance of station closest to the epicenter (degree) 0.07195
Epicentral distance of station farthest from the epicenter (degree) 0.62413
Number of stations at which the event was observed 9
Number of stations from which data was used for origin computation 9
Magnitudes information

ML:1.4

Field Value
Value 1.4
Uncertainty 0.3
Num. used stations 3
Type of magnitude ML
Reference to an origin 5615091
Agency INGV
Autore Manually reviewed by Franco Mele
Time of creation (UTC) 2015-01-15 13:07:23

ML:1.4

Field Value
Value 1.4
Uncertainty 0.3
Num. used stations 3
Type of magnitude ML
Reference to an origin 4740491
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2013-10-25 21:53:59
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.FIAM.HHE. 2013-10-25T21:45:27.42 0.6 undecidable manual S 24 69.2751 91 0.02 48
IV.GIUL.HHZ. 2013-10-25T21:45:20.50 0.6 undecidable manual S 111 43.0236 92 0.11 50
IV.FIAM.HHE. 2013-10-25T21:45:18.66 0.6 undecidable manual P 24 69.2751 91 0.11 47
IV.CERT.HHZ. 2013-10-25T21:45:17.40 0.6 undecidable manual S 32 32.745 93 -0.26 48
IV.PTQR.HHE. 2013-10-25T21:45:17.90 0.6 undecidable manual P 55 63.1923 91 0.29 46
IV.LATB.EHZ. 2013-10-25T21:45:16.40 0.6 undecidable manual S 145 27.75 94 0.08 51
IV.GIUL.HHZ. 2013-10-25T21:45:14.40 0.1 undecidable manual P 111 43.0236 92 -0.1 97
IV.MTCE.HHZ. 2013-10-25T21:45:13.45 0.3 undecidable manual P 356 36.0417 92 0.03 76
IV.LATB.EHZ. 2013-10-25T21:45:12.21 0.3 undecidable manual P 145 27.75 94 0.06 77
IV.MA9.HHZ. 2013-10-25T21:45:12.30 0.6 undecidable manual S 311 12.1767 118 0.03 52
IV.CERT.HHZ. 2013-10-25T21:45:12.70 0.3 undecidable manual P 32 32.745 93 -0.22 73
IV.RMP.HHZ. 2013-10-25T21:45:12.70 0.6 undecidable manual S 335 13.6752 112 0.06 52
IV.RDP.HHZ. 2013-10-25T21:45:11.40 0.6 undecidable manual S 326 7.9809 136 0.02 52
IV.RMP.HHZ. 2013-10-25T21:45:10.25 0.1 undecidable manual P 335 13.6752 112 0.23 100
IV.MA9.HHZ. 2013-10-25T21:45:09.36 0.3 undecidable manual P 311 12.1767 118 -0.45 73
IV.RDP.HHZ. 2013-10-25T21:45:09.36 0.3 undecidable manual P 326 7.9809 136 0.06 78
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.GIUL.HHN. ML:1.1 0.000035749999999999995 1.58 AML other m 2013-10-25T21:45:22.63
IV.GIUL.HHE. ML:1.0 0.00003185 0.9 AML other m 2013-10-25T21:45:23.29
IV.RDP.HHN. ML:1.7 0.000584 0.54 AML other m 2013-10-25T21:45:13.20
IV.RDP.HHE. ML:1.6 0.0004505 1.3 AML other m 2013-10-25T21:45:15.26
IV.RMP.HHE. ML:1.4 0.0002615 0.3 AML other m 2013-10-25T21:45:14.58
IV.RMP.HHN. ML:1.4 0.00026000000000000003 0.34 AML other m 2013-10-25T21:45:18.78
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