Earthquake with magnitude of ML 1.9 on date 23-11-2021 and time 01:52:56 (UTC) in region 4 km W Colleferro (RM)

A magnitude ML 1.9 earthquake occured in region: 4 km W Colleferro (RM), on

  • 23-11-2021 01:52:56 (UTC)
  • 23-11-2021 02:52:56 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 41.72, 12.959 at 9 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
Colleferro RM 4 21595 21595
Artena RM 4 14276 35871
Rocca Massima LT 6 1136 37007
Segni RM 6 9159 46166
Valmontone RM 7 15959 62125
Gavignano RM 8 1916 64041
Cori LT 9 11065 75106
Labico RM 10 6379 81485
Montelanico RM 10 2131 83616
Lariano RM 11 13432 97048
Cave RM 11 11287 108335
Genazzano RM 13 6036 114371
Paliano FR 13 8281 122652
Rocca di Cave RM 14 377 123029
Gorga RM 15 710 123739
Palestrina RM 15 21672 145411
Norma LT 15 3946 149357
Castel San Pietro Romano RM 15 902 150259
Velletri RM 16 53303 203562
Capranica Prenestina RM 16 351 203913
Anagni FR 17 21464 225377
Carpineto Romano RM 17 4524 229901
Sgurgola FR 17 2676 232577
Olevano Romano RM 17 6687 239264
Zagarolo RM 17 17843 257107
San Cesareo RM 17 15153 272260
Cisterna di Latina LT 18 36868 309128
Serrone FR 18 3099 312227
Rocca Priora RM 18 11962 324189
San Vito Romano RM 18 3273 327462
Sermoneta LT 19 9842 337304
Bellegra RM 19 2887 340191
Roiate RM 19 737 340928
Poli RM 20 2418 343346
Acuto FR 20 1920 345266
Bassiano LT 20 1583 346849
Piglio FR 20 4666 351515

Municipalities with at least 50000 inhabitants

An earthquake occurred to
16 Km E of Velletri (53303 inhabitants)
28 Km N of Latina (125985 inhabitants)
29 Km E of Aprilia (73446 inhabitants)
30 Km SE of Tivoli (56533 inhabitants)
37 Km SE of Guidonia Montecelio (88673 inhabitants)
38 Km E of Pomezia (62966 inhabitants)
41 Km NE of Anzio (54211 inhabitants)
44 Km E of Roma (2864731 inhabitants)
60 Km E of Fiumicino (78395 inhabitants)
79 Km SW of L'Aquila (69753 inhabitants)
97 Km S of Terni (111501 inhabitants)
Recent and historical seismicity
Seismic hazard
Shakemap
Felt maps
Preliminary map of the earthquake effects from the web questionnaire

Preliminary map of the earthquake effects from the web questionnaire

This map shows the distribution of earthquake resentment in the area, expressed in terms of intensity on the MCS scale (Mercalli-Cancani-Sieberg). Intensities are determined using data from questionnaires collected on the website http://www.hsit.it. The intensities shown are determined considering all the reports received from each municipality, and are all the more reliable the greater the number of questionnaires. The collected data are subjected to an automatic statistical filter, but are not checked individually. In particular, intensities greater than or equal to the VI degree of the MCS or EMS scale require on-site verification by specialized personnel. The black star is the epicenter of the earthquake that occurred. This map is updated every time citizens fill out new questionnaires. The number of questionnaires processed to obtain this map, the date and time of the last update are shown at the top right.
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Reviewed
Rev100
ML 1.9 2021-11-23
01:52:56
41.7198 12.9593 9 2021-11-23
01:58:54
Sala Sismica INGV-Roma 97705861
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-11-23 01:52:56 ± 0.05
Latitude 41.7198 ± 0.0027
Longitude 12.9593 ± 0.0048
Depth (km) 9 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 97705861

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 386
Semi-minor axis of confidence ellipse (meter) 320
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 291
Circular confidence region, given by single value of horizontal uncertainty (meter) 390
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 79
Number of associated phases, regardless of their use for origin computation 20
Number of defining phases 20
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) 0.1277
Epicentral distance of station farthest from the epicenter (degree) 0.51711
Number of stations at which the event was observed 12
Number of stations from which data was used for origin computation 12
Magnitude information

ML:1.9

Field Value
Value 1.9
Uncertainty 0.1
Num. used stations 6
Type of magnitude ML
Reference to an origin 97705861
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-11-23 01:58:54
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.GIUL.HHZ. 2021-11-23T01:53:07.71 0.3 undecidable manual S 126 0.2734 106 0.31 69
IV.LRP.EHZ. 2021-11-23T01:53:06.19 0.3 undecidable manual P 99 0.4739 50 -0.02 71
IV.VVLD.HHZ. 2021-11-23T01:53:06.93 0.3 positive manual P 73 0.5171 50 -0.02 70
IV.RMP.HHZ. 2021-11-23T01:53:05.18 0.3 undecidable manual S 296 0.2104 111 0.06 74
IV.CERT.HHZ. 2021-11-23T01:53:05.56 0.3 undecidable manual S 4 0.2293 109 -0.24 71
IV.LATB.EHZ. 2021-11-23T01:53:05.40 0.6 undecidable manual S 179 0.2257 110 -0.26 47
IV.LAV9.HHZ. 2021-11-23T01:53:04.65 0.1 undecidable manual S 258 0.1988 112 -0.04 100
IV.MTCE.HHZ. 2021-11-23T01:53:03.74 0.3 undecidable manual P 332 0.3435 50 -0.24 72
IV.RDP.HHZ. 2021-11-23T01:53:03.89 0.6 undecidable manual S 282 0.1898 113 -0.49 46
IV.RCAV.EHZ. 2021-11-23T01:53:02.43 0.3 undecidable manual S 355 0.1277 122 0.19 75
IV.GUAR.HHZ. 2021-11-23T01:53:02.71 0.3 undecidable manual P 74 0.2734 106 -0.05 74
IV.VIVA.HHZ. 2021-11-23T01:53:02.92 0.3 undecidable manual S 282 0.1439 119 0.12 75
IV.GIUL.HHZ. 2021-11-23T01:53:02.85 0.3 undecidable manual P 126 0.2734 106 0.09 72
IV.LAV9.HHZ. 2021-11-23T01:53:01.39 0.1 negative manual P 258 0.1988 112 0.19 97
IV.RMP.HHZ. 2021-11-23T01:53:01.50 0.3 positive manual P 296 0.2104 111 0.06 74
IV.CERT.HHZ. 2021-11-23T01:53:01.62 0.3 undecidable manual P 4 0.2293 109 -0.22 72
IV.LATB.EHZ. 2021-11-23T01:53:01.55 0.3 undecidable manual P 179 0.2257 110 -0.21 72
IV.RDP.HHZ. 2021-11-23T01:53:01.09 0.3 undecidable manual P 282 0.1898 113 0.07 74
IV.VIVA.HHZ. 2021-11-23T01:53:00.22 0.1 undecidable manual P 282 0.1439 119 0.12 100
IV.RCAV.EHZ. 2021-11-23T01:52:59.97 0.1 undecidable manual P 355 0.1277 122 0.19 99
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.RCAV.EHN. ML:1.6 0.0003665 1.64 AML other m 2021-11-23T01:53:02.91
IV.RCAV.EHE. ML:1.4 0.000292 0.28 AML other m 2021-11-23T01:53:03.14
IV.VIVA.HHE. ML:1.8 0.0006785 0.14 AML other m 2021-11-23T01:53:03.41
IV.VIVA.HHN. ML:2.1 0.001102 0.14 AML other m 2021-11-23T01:53:03.38
IV.LAV9.HHE. ML:1.9 0.0005115 0.4 AML other m 2021-11-23T01:53:05.39
IV.RMP.HHN. ML:2.1 0.000885 0.12 AML other m 2021-11-23T01:53:05.64
IV.RMP.HHE. ML:2 0.000671 0.32 AML other m 2021-11-23T01:53:05.52
IV.GIUL.HHN. ML:1.4 0.0001271 1.54 AML other m 2021-11-23T01:53:08.86
IV.LAV9.HNE. ML:1.9 0.000493 0.84 AML other m 2021-11-23T01:53:08.69
IV.GIUL.HHE. ML:1.2 6.89E-5 1.18 AML other m 2021-11-23T01:53:09.66
IV.LAV9.HNN. ML:1.9 0.000534 1.22 AML other m 2021-11-23T01:53:10.87
IV.LAV9.HHN. ML:1.8 0.000401 1.2 AML other m 2021-11-23T01:53:10.86
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