Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.9 on date 19-06-2021 and time 22:23:15 (Italy) in region 3 km SW Ariccia (RM)

A magnitude ML 1.9 earthquake occured in region: 3 km SW Ariccia (RM), on

  • 19-06-2021 20:23:15 (UTC)
  • 19-06-2021 22:23:15 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 41.7000, 12.6430 at 13 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
Ariccia RM 3 19407 19407
Albano Laziale RM 4 41715 61122
Genzano di Roma RM 4 23970 85092
Castel Gandolfo RM 5 8997 94089
Lanuvio RM 6 13632 107721
Nemi RM 7 1943 109664
Marino RM 8 43026 152690
Rocca di Papa RM 9 17034 169724
Grottaferrata RM 10 20327 190051
Velletri RM 11 53303 243354
Aprilia LT 12 73446 316800
Pomezia RM 12 62966 379766
Ciampino RM 12 38412 418178
Frascati RM 12 22087 440265
Ardea RM 13 49183 489448
Monte Porzio Catone RM 14 8693 498141
Monte Compatri RM 15 11978 510119
Rocca Priora RM 15 11962 522081
Lariano RM 16 13432 535513
Colonna RM 18 4287 539800
San Cesareo RM 19 15153 554953
Cisterna di Latina LT 20 36868 591821

Municipalities with at least 50000 inhabitants

An earthquake occurred to
11 Km W of Velletri (53303 inhabitants)
12 Km N of Aprilia (73446 inhabitants)
12 Km E of Pomezia (62966 inhabitants)
25 Km SE of Roma (2864731 inhabitants)
28 Km N of Anzio (54211 inhabitants)
32 Km SW of Tivoli (56533 inhabitants)
34 Km NW of Latina (125985 inhabitants)
34 Km S of Guidonia Montecelio (88673 inhabitants)
35 Km E of Fiumicino (78395 inhabitants)
83 Km SE of Civitavecchia (52991 inhabitants)
91 Km SE of Viterbo (67173 inhabitants)
96 Km S of Terni (111501 inhabitants)
96 Km SW of L'Aquila (69753 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 2021-06-19
20:23:15		 41.6997 12.6428 13 2021-12-29
11:12:08		 Bollettino Sismico Italiano INGV 92101501
Reviewed
Rev100 		ML 1.8 2021-06-19
20:23:15		 41.7053 12.6347 13 2021-06-19
20:36:06		 Sala Sismica INGV-Roma 91571931
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-06-19 20:23:15 ± 0.11
Latitude 41.6997 ± 0.0063
Longitude 12.6428 ± 0.0084
Depth (km) 13 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 92101501

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 873
Semi-minor axis of confidence ellipse (meter) 250
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 45
Circular confidence region, given by single value of horizontal uncertainty (meter) 870.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 204
Number of associated phases, regardless of their use for origin computation 30
Number of defining phases 16
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.2
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.47844
Number of stations at which the event was observed 24
Number of stations from which data was used for origin computation 10
Magnitudes information

ML:1.9

Field Value
Value 1.9
Uncertainty 0.1
Num. used stations 8
Type of magnitude ML
Reference to an origin 92101501
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-10-25 15:42:13

ML:1.8

Field Value
Value 1.8
Uncertainty 0.5
Num. used stations 12
Type of magnitude ML
Reference to an origin 91571931
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-06-19 20:36:06
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.ZEN8.EHZ. 2021-06-19T20:25:01.38 3.0 undecidable manual Sn 0.88 0
IV.NDIM.HHZ. 2021-06-19T20:24:44.35 3.0 undecidable manual Sn 1.96 0
AC.VLO.HHZ. 2021-06-19T20:24:37.52 3.0 undecidable manual Pn 6.68 0
IV.MABI.HHZ. 2021-06-19T20:24:28.16 3.0 undecidable manual Pg 8.48 0
IV.VARE.HHZ. 2021-06-19T20:24:26.88 3.0 undecidable manual Pn 1.55 0
IV.HVIT.HHZ. 2021-06-19T20:24:24.06 3.0 positive manual Pn -1.92 0
MN.TRI.HHZ. 2021-06-19T20:24:23.96 3.0 negative manual Pg 11.52 0
IV.SENI.HNZ. 2021-06-19T20:24:18.41 3.0 undecidable manual Sg 9.71 0
IV.CADC.EHZ. 2021-06-19T20:24:14.32 3.0 positive manual Pn 0.68 0
CR.STON.BHZ. 2021-06-19T20:24:13.82 3.0 undecidable manual Pn 2.73 0
IV.ORI.HHZ. 2021-06-19T20:24:13.66 3.0 undecidable manual Pg 10.04 0
IV.MGR.HHZ. 2021-06-19T20:23:59.37 3.0 positive manual Pg 4.2 0
IV.TERO.HHZ. 2021-06-19T20:23:47.23 3.0 undecidable manual Sn -0.34 0
IV.PP3.EHZ. 2021-06-19T20:23:45.09 3.0 negative manual Pg 3.66 0
IV.GIUL.HHZ. 2021-06-19T20:23:24.55 0.3 undecidable manual P 107 53.1024 92 -0.29 65
IV.CERT.HHZ. 2021-06-19T20:23:22.73 0.3 undecidable manual P 45 39.3273 93 0.01 71
IV.RMP.HHZ. 2021-06-19T20:23:21.49 0.3 undecidable manual S 22 13.4754 117 0.07 73
IV.RCAV.EHZ. 2021-06-19T20:23:21.51 0.6 undecidable manual P 57 29.9478 95 0.24 46
IV.LATB.EHZ. 2021-06-19T20:23:21.77 0.3 undecidable manual P 131 34.9428 94 -0.27 67
IV.SAMA.EHZ. 2021-06-19T20:23:20.30 0.3 undecidable manual S 335 9.879 130 -0.32 72
IV.RDP.HHZ. 2021-06-19T20:23:20.38 0.3 undecidable manual S 40 8.7801 135 -0.01 75
IV.VIVA.HHZ. 2021-06-19T20:23:20.74 0.3 undecidable manual S 62 11.9769 122 -0.32 70
IV.MA9.HHZ. 2021-06-19T20:23:19.98 0.3 undecidable manual S 10 7.881 139 -0.26 73
IV.RMP.HHZ. 2021-06-19T20:23:19.00 0.1 undecidable manual P 22 13.4754 117 0.2 96
IV.LAV9.HNZ. 2021-06-19T20:23:19.97 0.3 undecidable manual S 118 5.2947 151 0.14 74
IV.LAV9.HNZ. 2021-06-19T20:23:18.17 0.3 undecidable manual P 118 5.2947 151 0.29 72
IV.RDP.HHZ. 2021-06-19T20:23:18.34 0.3 undecidable manual P 40 8.7801 135 0.13 73
IV.VIVA.HHZ. 2021-06-19T20:23:18.84 0.3 undecidable manual P 62 11.9769 122 0.25 72
IV.SAMA.EHZ. 2021-06-19T20:23:18.29 0.1 undecidable manual P 335 9.879 130 -0.05 100
IV.MA9.HHZ. 2021-06-19T20:23:18.25 0.6 undecidable manual P 10 7.881 139 0.13 49
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.RMP.HHE. ML:1.8 0.00064 0.12 AML other m 2021-06-19T20:23:21.73
IV.RMP.HHN. ML:1.9 0.0008235 0.36 AML other m 2021-06-19T20:23:21.60
IV.LAV9.HHN. ML:2.0 0.00126 0.26 AML other m 2021-06-19T20:23:21.79
IV.LAV9.HNN. ML:1.9 0.001185 0.28 AML other m 2021-06-19T20:23:21.79
IV.VIVA.HHE. ML:1.9 0.000822 0.52 AML other m 2021-06-19T20:23:21.96
IV.LAV9.HHE. ML:2.0 0.00133 0.42 AML other m 2021-06-19T20:23:23.12
IV.LAV9.HNE. ML:2.0 0.0012144999999999999 0.24 AML other m 2021-06-19T20:23:23.13
IV.VIVA.HHN. ML:1.9 0.0008965 1.64 AML other m 2021-06-19T20:23:24.13
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