Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.9 on date 26-12-2019 and time 00:34:49 (Italy) in region 5 km SE Velletri (RM)

A magnitude ML 1.9 earthquake occured in region: 5 km SE Velletri (RM), on

  • 25-12-2019 23:34:49 (UTC)
  • 26-12-2019 00:34:49 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 41.6550, 12.8150 at 9 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 5 53303 53303
Cisterna di Latina LT 7 36868 90171
Cori LT 8 11065 101236
Lariano RM 8 13432 114668
Rocca Massima LT 9 1136 115804
Lanuvio RM 10 13632 129436
Nemi RM 11 1943 131379
Genzano di Roma RM 12 23970 155349
Artena RM 13 14276 169625
Ariccia RM 14 19407 189032
Rocca di Papa RM 15 17034 206066
Norma LT 15 3946 210012
Aprilia LT 15 73446 283458
Albano Laziale RM 15 41715 325173
Labico RM 16 6379 331552
Rocca Priora RM 16 11962 343514
Valmontone RM 16 15959 359473
Castel Gandolfo RM 17 8997 368470
Segni RM 18 9159 377629
Colleferro RM 18 21595 399224
Marino RM 18 43026 442250
Monte Compatri RM 18 11978 454228
Sermoneta LT 18 9842 464070
San Cesareo RM 19 15153 479223
Montelanico RM 19 2131 481354
Grottaferrata RM 19 20327 501681
Monte Porzio Catone RM 20 8693 510374

Municipalities with at least 50000 inhabitants

An earthquake occurred to
5 Km SE of Velletri (53303 inhabitants)
15 Km E of Aprilia (73446 inhabitants)
22 Km NW of Latina (125985 inhabitants)
26 Km E of Pomezia (62966 inhabitants)
28 Km NE of Anzio (54211 inhabitants)
34 Km S of Tivoli (56533 inhabitants)
38 Km SE of Roma (2864731 inhabitants)
39 Km S of Guidonia Montecelio (88673 inhabitants)
50 Km E of Fiumicino (78395 inhabitants)
91 Km SW of L'Aquila (69753 inhabitants)
98 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 1.9 2019-12-25
23:34:49		 41.6553 12.8152 9 2020-02-28
16:42:15		 Bollettino Sismico Italiano INGV 75017161
Reviewed
Rev100 		ML 1.9 2019-12-25
23:34:49		 41.6627 12.826 8 2019-12-25
23:40:42		 Sala Sismica INGV-Roma 74978321
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2019-12-25 23:34:49 ± 0.06
Latitude 41.6553 ± 0.0036
Longitude 12.8152 ± 0.0060
Depth (km) 9 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 75017161

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 493
Semi-minor axis of confidence ellipse (meter) 388
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 261
Circular confidence region, given by single value of horizontal uncertainty (meter) 490.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 138
Number of associated phases, regardless of their use for origin computation 17
Number of defining phases 17
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.17
Epicentral distance of station closest to the epicenter (degree) 0.08993
Epicentral distance of station farthest from the epicenter (degree) 0.56927
Number of stations at which the event was observed 10
Number of stations from which data was used for origin computation 10
Magnitudes information

ML:1.9

Field Value
Value 1.9
Uncertainty 0.4
Num. used stations 10
Type of magnitude ML
Reference to an origin 75017161
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2020-01-03 15:19:25

ML:1.9

Field Value
Value 1.9
Uncertainty 0.4
Num. used stations 10
Type of magnitude ML
Reference to an origin 74978321
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2019-12-25 23:40:42
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.GUAR.HHZ. 2019-12-25T23:35:03.95 0.3 undecidable manual S 69 43.9227 50 -0.17 69
IV.GIUL.HHZ. 2019-12-25T23:35:02.86 0.3 undecidable manual S 106 38.0286 50 0.32 67
IV.PTQR.HHZ. 2019-12-25T23:35:00.77 0.3 undecidable manual P 50 63.1923 50 -0.11 67
IV.RCAV.EHZ. 2019-12-25T23:34:58.54 0.3 undecidable manual S 27 23.8539 110 0.26 70
IV.GUAR.HHZ. 2019-12-25T23:34:57.86 0.1 undecidable manual P 69 43.9227 50 -0.06 94
IV.LATB.EHZ. 2019-12-25T23:34:57.45 0.6 undecidable manual S 146 21.6672 112 -0.12 48
IV.GIUL.HHZ. 2019-12-25T23:34:56.83 0.1 undecidable manual P 106 38.0286 50 -0.18 93
IV.RDP.HHZ. 2019-12-25T23:34:55.28 0.6 undecidable manual S 323 14.5743 121 -0.07 49
IV.LATB.EHZ. 2019-12-25T23:34:54.19 0.1 undecidable manual P 146 21.6672 112 0.05 98
IV.SAMA.EHZ. 2019-12-25T23:34:54.65 0.3 undecidable manual P 307 23.0547 111 0.25 70
IV.VIVA.HHZ. 2019-12-25T23:34:54.09 0.6 undecidable manual S 340 11.1777 128 -0.3 47
IV.RCAV.EHZ. 2019-12-25T23:34:54.54 0.3 undecidable manual P 27 23.8539 110 0 74
IV.RMP.HHN. 2019-12-25T23:34:53.86 0.3 undecidable manual P 332 19.6692 114 0.1 73
IV.LAV9.HHZ. 2019-12-25T23:34:53.86 0.3 undecidable manual S 284 9.9789 132 -0.21 72
IV.VIVA.HHZ. 2019-12-25T23:34:52.21 0.1 undecidable manual P 340 11.1777 128 -0.09 99
IV.LAV9.HHZ. 2019-12-25T23:34:52.37 0.1 undecidable manual P 284 9.9789 132 0.25 96
IV.RDP.HHZ. 2019-12-25T23:34:52.86 0.1 undecidable manual P 323 14.5743 121 0 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.VIVA.HHE. ML:2.3 0.0024655465000000005 0.4224 AML other m 2019-12-25T23:34:54.52
IV.LAV9.HNN. ML:2.1 0.0017425615 0.3712 AML other m 2019-12-25T23:34:55.06
IV.LAV9.HHN. ML:2.1 0.001739245 0.3584 AML other m 2019-12-25T23:34:55.07
IV.LAV9.HNE. ML:2.1 0.00162648875 0.3712 AML other m 2019-12-25T23:34:55.36
IV.LAV9.HHE. ML:2.1 0.0017583725000000002 0.4736 AML other m 2019-12-25T23:34:55.36
IV.VIVA.HHN. ML:2.1 0.0017151505 0.2816 AML other m 2019-12-25T23:34:56.12
IV.GIUL.HHE. ML:1.0 0.000038608945 1.5392 AML other m 2019-12-25T23:35:02.97
IV.GIUL.HHN. ML:1.1 0.00004394477 0.2048 AML other m 2019-12-25T23:35:04.63
IV.GUAR.HHN. ML:1.4 0.00007483547999999999 1.7952 AML other m 2019-12-25T23:35:04.94
IV.GUAR.HHE. ML:1.3 0.000065832425 0.3328 AML other m 2019-12-25T23:35:05.87
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