Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.6 on date 19-04-2021 and time 23:53:45 (Italy) in region 2 km W Labico (RM)

A magnitude ML 1.6 earthquake occured in region: 2 km W Labico (RM), on

  • 19-04-2021 21:53:45 (UTC)
  • 19-04-2021 23:53:45 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 41.7860, 12.8630 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
Labico RM 2 6379 6379
Valmontone RM 5 15959 22338
Palestrina RM 6 21672 44010
San Cesareo RM 7 15153 59163
Zagarolo RM 7 17843 77006
Artena RM 7 14276 91282
Lariano RM 7 13432 104714
Cave RM 7 11287 116001
Castel San Pietro Romano RM 7 902 116903
Rocca Priora RM 8 11962 128865
Rocca di Cave RM 10 377 129242
Gallicano nel Lazio RM 10 6334 135576
Genazzano RM 11 6036 141612
Monte Compatri RM 11 11978 153590
Colonna RM 11 4287 157877
Capranica Prenestina RM 11 351 158228
Poli RM 12 2418 160646
Monte Porzio Catone RM 13 8693 169339
Rocca Massima LT 13 1136 170475
Velletri RM 13 53303 223778
Rocca di Papa RM 13 17034 240812
Colleferro RM 13 21595 262407
Casape RM 14 744 263151
Nemi RM 14 1943 265094
San Vito Romano RM 15 3273 268367
San Gregorio da Sassola RM 15 1619 269986
Frascati RM 15 22087 292073
Pisoniano RM 16 770 292843
Grottaferrata RM 16 20327 313170
Olevano Romano RM 16 6687 319857
Cori LT 16 11065 330922
Paliano FR 17 8281 339203
Genzano di Roma RM 17 23970 363173
Marino RM 17 43026 406199
Segni RM 17 9159 415358
Ariccia RM 17 19407 434765
Bellegra RM 17 2887 437652
Lanuvio RM 18 13632 451284
Albano Laziale RM 18 41715 492999
Castel Gandolfo RM 18 8997 501996
Gavignano RM 19 1916 503912
Rocca Santo Stefano RM 19 975 504887
Roiate RM 20 737 505624
Gerano RM 20 1263 506887

Municipalities with at least 50000 inhabitants

An earthquake occurred to
13 Km NE of Velletri (53303 inhabitants)
21 Km S of Tivoli (56533 inhabitants)
26 Km SE of Guidonia Montecelio (88673 inhabitants)
28 Km NE of Aprilia (73446 inhabitants)
33 Km E of Pomezia (62966 inhabitants)
34 Km E of Roma (2864731 inhabitants)
36 Km N of Latina (125985 inhabitants)
42 Km NE of Anzio (54211 inhabitants)
52 Km E of Fiumicino (78395 inhabitants)
77 Km SW of L'Aquila (69753 inhabitants)
88 Km S of Terni (111501 inhabitants)
94 Km SE of Viterbo (67173 inhabitants)
95 Km E 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 1.6 2021-04-19
21:53:45		 41.7862 12.8627 10 2021-07-12
16:55:14		 Bollettino Sismico Italiano INGV 90967761
Reviewed
Rev100 		ML 1.6 2021-04-19
21:53:45		 41.7858 12.866 10 2021-04-19
22:00:10		 Sala Sismica INGV-Roma 89269921
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-04-19 21:53:45 ± 0.1
Latitude 41.7862 ± 0.0072
Longitude 12.8627 ± 0.0096
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 90967761

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 956
Semi-minor axis of confidence ellipse (meter) 476
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 318
Circular confidence region, given by single value of horizontal uncertainty (meter) 960.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 83
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) 0.28
Epicentral distance of station closest to the epicenter (degree) 0.07734
Epicentral distance of station farthest from the epicenter (degree) 0.37052
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:1.6

Field Value
Value 1.6
Uncertainty 0.4
Num. used stations 14
Type of magnitude ML
Reference to an origin 89269921
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-04-19 22:00:10

ML:1.6

Field Value
Value 1.6
Uncertainty 0.4
Num. used stations 14
Type of magnitude ML
Reference to an origin 90967761
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-06-09 09:53:18
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.GIUL.HHZ. 2021-04-19T21:53:59.49 0.3 undecidable manual S 128 41.1255 50 0.62 61
IV.LATB.EHZ. 2021-04-19T21:53:56.33 0.3 undecidable manual S 166 33.4443 50 -0.49 65
IV.CERT.HHZ. 2021-04-19T21:53:53.03 0.3 undecidable manual S 29 20.5683 116 -0.05 73
IV.GIUL.HHZ. 2021-04-19T21:53:52.95 0.1 positive manual P 128 41.1255 50 -0.13 92
IV.LAV9.HHZ. 2021-04-19T21:53:52.97 0.3 undecidable manual S 228 18.1707 119 0.64 63
IV.MTCE.HHN. 2021-04-19T21:53:51.36 0.6 undecidable manual P 339 28.0497 50 0.3 46
IV.LATB.EHZ. 2021-04-19T21:53:51.45 0.3 undecidable manual P 166 33.4443 50 -0.44 66
IV.RDP.HHZ. 2021-04-19T21:53:50.70 0.3 undecidable manual S 257 12.9759 127 -0.11 73
IV.RMP.HHZ. 2021-04-19T21:53:50.65 0.3 undecidable manual S 282 13.3755 126 -0.28 70
IV.VIVA.HHZ. 2021-04-19T21:53:49.34 0.3 undecidable manual S 242 8.5803 139 -0.37 70
IV.RCAV.EHN. 2021-04-19T21:53:49.96 0.3 undecidable manual S 45 9.5793 136 0.01 75
IV.LAV9.HHZ. 2021-04-19T21:53:49.55 0.3 undecidable manual P 228 18.1707 119 0.25 70
IV.CERT.HHZ. 2021-04-19T21:53:49.76 0.3 undecidable manual P 29 20.5683 116 0.02 73
IV.RMP.HHZ. 2021-04-19T21:53:48.53 0.1 negative manual P 282 13.3755 126 0.04 99
IV.RDP.HHZ. 2021-04-19T21:53:48.60 0.1 undecidable manual P 257 12.9759 127 0.18 96
IV.VIVA.HHZ. 2021-04-19T21:53:47.78 0.1 positive manual P 242 8.5803 139 -0.01 100
IV.RCAV.EHN. 2021-04-19T21:53:47.88 0.3 undecidable manual P 45 9.5793 136 -0.04 74
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.VIVA.HHE. ML:1.9 0.00118950955 0.2432 AML other m 2021-04-19T21:53:49.86
IV.VIVA.HHN. ML:2.0 0.00146 1.68 AML other m 2021-04-19T21:53:50.04
IV.RDP.HHE. ML:1.4 0.00026722755 0.3584 AML other m 2021-04-19T21:53:51.30
IV.RMP.HHN. ML:2.0 0.0010470996500000001 0.2432 AML other m 2021-04-19T21:53:51.15
IV.RDP.HHN. ML:1.8 0.000729 0.28 AML other m 2021-04-19T21:53:51.36
IV.RMP.HHE. ML:1.9 0.0008845 0.26 AML other m 2021-04-19T21:53:51.64
IV.CERT.HHE. ML:0.5 0.00002465 0.2 AML other m 2021-04-19T21:53:53.86
IV.LAV9.HNE. ML:1.6 0.0003383956500000001 0.2688 AML other m 2021-04-19T21:53:54.50
IV.CERT.HHN. ML:0.6 0.000030550000000000004 0.12 AML other m 2021-04-19T21:53:55.89
IV.LAV9.HNN. ML:1.5 0.00027248830000000003 0.3328 AML other m 2021-04-19T21:53:56.36
IV.LAV9.HHN. ML:1.5 0.00023727229999999998 0.32 AML other m 2021-04-19T21:53:56.36
IV.LAV9.HHE. ML:1.6 0.0003375 0.34 AML other m 2021-04-19T21:53:56.73
IV.GIUL.HHE. ML:1.0 0.000034043940000000004 0.2816 AML other m 2021-04-19T21:54:00.19
IV.GIUL.HHN. ML:0.8 0.000021011895000000004 0.4096 AML other m 2021-04-19T21:54:02.48
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