Earthquake with magnitude of ML 1.6 on date 20-11-2019 and time 09:27:42 (UTC) in region 4 km N Colonna (RM)

A magnitude ML 1.6 earthquake occured in region: 4 km N Colonna (RM), on

  • 20-11-2019 09:27:42 (UTC)
  • 20-11-2019 10:27:42 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 41.87, 12.76 at 6 km depth.

The earthquake was located by: Sala Sismica INGV-Roma.

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.

Municipalities within 20 km from the epicenter

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Colonna RM 4 4287 4287
Gallicano nel Lazio RM 5 6334 10621
San Cesareo RM 6 15153 25774
Zagarolo RM 7 17843 43617
Monte Porzio Catone RM 7 8693 52310
Monte Compatri RM 7 11978 64288
Rocca Priora RM 8 11962 76250
Frascati RM 10 22087 98337
San Gregorio da Sassola RM 11 1619 99956
Tivoli RM 11 56533 156489
Casape RM 11 744 157233
Palestrina RM 11 21672 178905
Poli RM 11 2418 181323
Castel San Pietro Romano RM 12 902 182225
Grottaferrata RM 12 20327 202552
Rocca di Papa RM 13 17034 219586
Marino RM 14 43026 262612
Labico RM 14 6379 268991
Guidonia Montecelio RM 15 88673 357664
Castel Madama RM 15 7399 365063
Ciampino RM 15 38412 403475
Cave RM 15 11287 414762
Rocca di Cave RM 16 377 415139
Capranica Prenestina RM 16 351 415490
Castel Gandolfo RM 16 8997 424487
Valmontone RM 17 15959 440446
Lariano RM 17 13432 453878
Nemi RM 17 1943 455821
Pisoniano RM 17 770 456591
San Polo dei Cavalieri RM 17 2992 459583
Marcellina RM 18 7280 466863
Albano Laziale RM 18 41715 508578
Genazzano RM 18 6036 514614
Ariccia RM 18 19407 534021
Ciciliano RM 18 1336 535357
Fonte Nuova RM 18 32562 567919
San Vito Romano RM 19 3273 571192
Sant'Angelo Romano RM 19 5018 576210
Genzano di Roma RM 19 23970 600180
Vicovaro RM 20 4019 604199
Artena RM 20 14276 618475
Sambuci RM 20 925 619400

Municipalities with at least 50000 inhabitants

An earthquake occurred to
11 Km SW of Tivoli (56533 inhabitants)
15 Km S of Guidonia Montecelio (88673 inhabitants)
21 Km N of Velletri (53303 inhabitants)
23 Km E of Roma (2864731 inhabitants)
31 Km NE of Pomezia (62966 inhabitants)
32 Km N of Aprilia (73446 inhabitants)
45 Km E of Fiumicino (78395 inhabitants)
46 Km N of Latina (125985 inhabitants)
48 Km N of Anzio (54211 inhabitants)
75 Km SW of L'Aquila (69753 inhabitants)
77 Km S of Terni (111501 inhabitants)
81 Km SE of Viterbo (67173 inhabitants)
84 Km E of Civitavecchia (52991 inhabitants)
Recent and historical Seismicity
Seismic hazard
Shakemap
Felt maps
The earthquake effects in MCS scale as obtained from the compiled questionnaire

The earthquake effects in MCS scale as obtained from the compiled questionnaire

This map shows the distribution of the effects of the earthquake on the territory in terms of the MCS (Mercalli-Cancani-Sieberg) intensity scale. The intensities are determined using the data provided in the questionnaire (http://www.haisentitoilterremoto.it/) that are analysed using robust statistical techniques since they are not verified individually. Specifically, the assignment of MCS intensities greater or equal the VI degree of the MCS scale require opportune in situ verification by professional experts. The purple start shows the epicenter. This map is prepared every so often that the population fill in new questionnaires. The number of questionnaires used to determine the map and the date and time of the last adjournment are shown in the upper right part of the panel.
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Rev 100 ML 1.6 2019-11-20
09:27:42
41.87 12.76 6 2019-11-20
10:46:14
Sala Sismica INGV-Roma 73932791
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2019-11-20 09:27:42 ± 0.16
Latitude 41.87 ± 0.01
Longitude 12.76 ± 0.00
Depth (km) 6 ± 2 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 73932791

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 518
Semi-minor axis of confidence ellipse (meter) 382
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 324
Circular confidence region, given by single value of horizontal uncertainty (meter) 520
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 121
Number of associated phases, regardless of their use for origin computation 12
Number of defining phases 11
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
Epicentral distance of station farthest from the epicenter (degree) 0.18256
Number of stations at which the event was observed 7
Number of stations from which data was used for origin computation 6
Magnitude information

ML:1.6

Field Value
Value 1.6
Uncertainty 0.3
Num. used stations 4
Type of magnitude ML
Reference to an origin 73932791
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2019-11-20 10:46:14
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IT.VNF1.HGZ. 2019-11-20T09:27:51.08 3.0 positive manual P 0 0
IV.CERT.HHZ. 2019-11-20T09:27:49.55 0.1 undecidable manual S 65 0.1826 106 -0.02 98
IV.SAMA.EHN. 2019-11-20T09:27:48.22 0.3 undecidable manual S 234 0.1538 109 -0.32 69
IV.RDP.HHE. 2019-11-20T09:27:47.45 0.3 undecidable manual S 199 0.116 115 0.26 71
IV.RCAV.EHE. 2019-11-20T09:27:47.92 0.1 undecidable manual S 100 0.1394 111 -0.1 97
IV.MTCE.HHZ. 2019-11-20T09:27:46.00 0.1 undecidable manual P 355 0.1529 109 0.16 96
IV.CERT.HHZ. 2019-11-20T09:27:46.33 0.1 undecidable manual P 65 0.1826 106 -0.15 95
IV.SAMA.EHN. 2019-11-20T09:27:45.85 0.1 undecidable manual P 234 0.1538 109 -0.03 98
IV.RDP.HHE. 2019-11-20T09:27:45.11 0.3 undecidable manual P 199 0.116 115 0.01 75
IV.RMP.HHZ. 2019-11-20T09:27:45.74 0.1 undecidable manual S 216 0.0737 126 -0.02 100
IV.RCAV.EHE. 2019-11-20T09:27:45.76 0.3 undecidable manual P 100 0.1394 111 0.18 72
IV.RMP.HHZ. 2019-11-20T09:27:44.35 0.1 undecidable manual P 216 0.0737 126 0.08 99
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.RMP.HHE. ML:1.9 0.00149 1.64 AML other m 2019-11-20T09:27:45.08
IV.RMP.HHN. ML:1.8 0.001195 0.26 AML other m 2019-11-20T09:27:46.40
IV.CERT.HHN. ML:1.3 0.000157 0.22 AML other m 2019-11-20T09:27:50.36
IV.CERT.HHE. ML:1.3 0.0001635 0.6 AML other m 2019-11-20T09:27:51.39
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
Download
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download