Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.5 on date 20-09-2019 and time 21:54:59 (Italy) in region 4 km W Gallicano nel Lazio (RM)

A magnitude ML 1.5 earthquake occured in region: 4 km W Gallicano nel Lazio (RM), on

  • 20-09-2019 19:54:59 (UTC)
  • 20-09-2019 21:54:59 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 41.8660, 12.7780 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
Gallicano nel Lazio RM 4 6334 6334
Colonna RM 4 4287 10621
Zagarolo RM 5 17843 28464
San Cesareo RM 5 15153 43617
Monte Compatri RM 7 11978 55595
Monte Porzio Catone RM 8 8693 64288
Rocca Priora RM 8 11962 76250
Palestrina RM 10 21672 97922
San Gregorio da Sassola RM 10 1619 99541
Poli RM 10 2418 101959
Castel San Pietro Romano RM 10 902 102861
Casape RM 10 744 103605
Frascati RM 10 22087 125692
Tivoli RM 11 56533 182225
Grottaferrata RM 13 20327 202552
Labico RM 13 6379 208931
Rocca di Papa RM 13 17034 225965
Cave RM 14 11287 237252
Rocca di Cave RM 14 377 237629
Castel Madama RM 14 7399 245028
Capranica Prenestina RM 15 351 245379
Marino RM 15 43026 288405
Valmontone RM 15 15959 304364
Guidonia Montecelio RM 16 88673 393037
Pisoniano RM 16 770 393807
Lariano RM 16 13432 407239
Ciampino RM 16 38412 445651
Genazzano RM 17 6036 451687
Castel Gandolfo RM 17 8997 460684
Nemi RM 17 1943 462627
San Vito Romano RM 17 3273 465900
San Polo dei Cavalieri RM 17 2992 468892
Ciciliano RM 17 1336 470228
Marcellina RM 18 7280 477508
Albano Laziale RM 18 41715 519223
Artena RM 18 14276 533499
Ariccia RM 18 19407 552906
Sambuci RM 19 925 553831
Genzano di Roma RM 19 23970 577801
Vicovaro RM 19 4019 581820
Cerreto Laziale RM 19 1118 582938
Gerano RM 20 1263 584201
Sant'Angelo Romano RM 20 5018 589219
Fonte Nuova RM 20 32562 621781
Velletri RM 20 53303 675084

Municipalities with at least 50000 inhabitants

An earthquake occurred to
11 Km S of Tivoli (56533 inhabitants)
16 Km S of Guidonia Montecelio (88673 inhabitants)
20 Km N of Velletri (53303 inhabitants)
25 Km E of Roma (2864731 inhabitants)
32 Km NE of Pomezia (62966 inhabitants)
32 Km NE of Aprilia (73446 inhabitants)
45 Km N of Latina (125985 inhabitants)
46 Km E of Fiumicino (78395 inhabitants)
48 Km N of Anzio (54211 inhabitants)
75 Km SW of L'Aquila (69753 inhabitants)
78 Km S of Terni (111501 inhabitants)
83 Km SE of Viterbo (67173 inhabitants)
85 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 1.5 2019-09-20
19:54:59		 41.866 12.7785 9 2020-02-28
16:41:52		 Bollettino Sismico Italiano INGV 72694551
Reviewed
Rev100 		ML 1.5 2019-09-20
19:55:00		 41.8827 12.766 8 2019-09-20
20:10:27		 Sala Sismica INGV-Roma 72594511
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2019-09-20 19:54:59 ± 0.08
Latitude 41.8660 ± 0.0045
Longitude 12.7785 ± 0.0072
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 72694551

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 586
Semi-minor axis of confidence ellipse (meter) 388
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 272
Circular confidence region, given by single value of horizontal uncertainty (meter) 590.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 106
Number of associated phases, regardless of their use for origin computation 27
Number of defining phases 24
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.31
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.47394
Number of stations at which the event was observed 14
Number of stations from which data was used for origin computation 12
Magnitudes information

ML:1.5

Field Value
Value 1.5
Uncertainty 0.4
Num. used stations 12
Type of magnitude ML
Reference to an origin 72594511
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2019-09-20 20:10:27

ML:1.5

Field Value
Value 1.5
Uncertainty 0.3
Num. used stations 10
Type of magnitude ML
Reference to an origin 72694551
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2019-11-22 13:14:25
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.GIUL.HHZ. 2019-09-20T19:55:17.30 0.6 undecidable manual S 131 52.1034 50 0.77 50
IV.FIAM.HHE. 2019-09-20T19:55:16.27 0.3 undecidable manual S 32 52.6029 50 -0.37 86
IV.SRES.HHE. 2019-09-20T19:55:15.30 0.3 undecidable manual S 332 46.7199 50 0.22 90
IV.BARO.EHZ. 2019-09-20T19:55:15.92 3.0 undecidable manual P 0
IT.MMP1.HGE. 2019-09-20T19:55:13.90 0.3 undecidable manual S 357 42.624 50 -0.07 94
IV.LATB.EHZ. 2019-09-20T19:55:13.70 0.3 undecidable manual S 160 44.0226 50 -0.65 81
IT.CSO1.HGZ. 2019-09-20T19:55:12.38 3.0 undecidable manual S 0.09 0
IV.FIAM.HHE. 2019-09-20T19:55:09.51 0.6 undecidable manual P 32 52.6029 50 0 62
IV.GIUL.HHZ. 2019-09-20T19:55:09.28 0.3 undecidable manual P 131 52.1034 50 -0.16 90
IV.SRES.HHE. 2019-09-20T19:55:09.21 0.3 undecidable manual P 332 46.7199 50 0.61 82
IT.MMP1.HGE. 2019-09-20T19:55:08.26 0.3 undecidable manual P 357 42.624 50 0.29 90
IV.LATB.EHZ. 2019-09-20T19:55:07.68 0.3 undecidable manual P 160 44.0226 50 -0.51 85
IT.CSO1.HGZ. 2019-09-20T19:55:07.02 3.0 undecidable manual P 0.04 0
IV.CERT.HHZ. 2019-09-20T19:55:07.00 0.3 undecidable manual S 61 19.1697 116 -0.16 96
IV.MTCE.HHZ. 2019-09-20T19:55:06.40 0.3 undecidable manual S 350 17.6712 118 -0.3 93
IV.RCAV.EHZ. 2019-09-20T19:55:05.60 0.3 undecidable manual S 99 13.9749 124 0.01 100
IV.VIVA.HHZ. 2019-09-20T19:55:05.40 0.3 undecidable manual S 183 12.876 126 0.11 98
IV.RDP.HHZ. 2019-09-20T19:55:05.80 0.3 undecidable manual S 206 12.9759 126 0.47 91
IV.MA9.HHN. 2019-09-20T19:55:05.30 0.3 undecidable manual S 223 14.5743 123 -0.47 91
IV.CERT.HHZ. 2019-09-20T19:55:04.10 0.3 undecidable manual P 61 19.1697 116 0.07 98
IV.RDP.HHZ. 2019-09-20T19:55:03.41 0.3 undecidable manual P 206 12.9759 126 0.43 92
IV.RCAV.EHZ. 2019-09-20T19:55:03.37 0.3 undecidable manual P 99 13.9749 124 0.24 95
IV.RMP.HHZ. 2019-09-20T19:55:03.70 0.3 undecidable manual S 226 8.7801 137 -0.51 90
IV.MTCE.HHZ. 2019-09-20T19:55:03.69 0.3 undecidable manual P 350 17.6712 118 -0.08 98
IV.VIVA.HHZ. 2019-09-20T19:55:03.40 0.3 undecidable manual P 183 12.876 126 0.45 91
IV.MA9.HHN. 2019-09-20T19:55:02.96 1.0 undecidable manual P 223 14.5743 123 -0.27 32
IV.RMP.HHZ. 2019-09-20T19:55:02.29 0.3 undecidable manual P 226 8.7801 137 -0.05 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.VIVA.HHN. ML:0.0 0.0006527609 0.3328 AML other m 2019-09-20T19:55:06.43
IV.VIVA.HHE. ML:0.0 0.0009184753 0.2432 AML other m 2019-09-20T19:55:09.97
IV.RMP.HHE. ML:1.8 0.0010161079 0.2688 AML other m 2019-09-20T19:55:05.84
IV.RCAV.EHE. ML:1.0 0.00011412025 0.1792 AML other m 2019-09-20T19:55:07.06
IV.RDP.HHN. ML:1.7 0.0005126787500000001 0.192 AML other m 2019-09-20T19:55:06.87
IV.RDP.HHE. ML:1.8 0.0006829571000000001 0.3968 AML other m 2019-09-20T19:55:08.29
IV.MTCE.HHN. ML:1.2 0.00014253765 0.3584 AML other m 2019-09-20T19:55:07.24
IV.MTCE.HHE. ML:1.3 0.0001677091 0.2688 AML other m 2019-09-20T19:55:07.11
IV.CERT.HHE. ML:1.2 0.00011287755000000001 0.1792 AML other m 2019-09-20T19:55:07.99
IV.CERT.HHN. ML:1.2 0.00011811749999999999 0.128 AML other m 2019-09-20T19:55:07.93
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