Earthquake with magnitude of ML 1.5 on date 16-10-2021 and time 00:22:59 (UTC) in region 2 km S Riofreddo (RM)

A magnitude ML 1.5 earthquake occured in region: 2 km S Riofreddo (RM), on

  • 16-10-2021 00:22:59 (UTC)
  • 16-10-2021 02:22:59 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.046, 12.994 at 3 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
Arsoli RM 2 1586 1586
Riofreddo RM 2 781 2367
Roviano RM 2 1351 3718
Cineto Romano RM 3 601 4319
Oricola AQ 4 1244 5563
Anticoli Corrado RM 4 915 6478
Vallinfreda RM 4 283 6761
Saracinesco RM 6 185 6946
Mandela RM 6 917 7863
Marano Equo RM 6 779 8642
Vivaro Romano RM 6 182 8824
Rocca di Botte AQ 7 856 9680
Agosta RM 8 1765 11445
Roccagiovine RM 8 263 11708
Sambuci RM 8 925 12633
Licenza RM 8 1011 13644
Percile RM 9 255 13899
Cervara di Roma RM 9 455 14354
Pereto AQ 9 682 15036
Vicovaro RM 9 4019 19055
Carsoli AQ 9 5396 24451
Camerata Nuova RM 10 447 24898
Ciciliano RM 10 1336 26234
Rocca Canterano RM 10 196 26430
Turania RI 10 241 26671
Orvinio RI 11 405 27076
Collalto Sabino RI 11 442 27518
Cerreto Laziale RM 11 1118 28636
Canterano RM 12 351 28987
Gerano RM 12 1263 30250
Castel Madama RM 13 7399 37649
Pozzaglia Sabina RI 13 360 38009
San Polo dei Cavalieri RM 13 2992 41001
Nespolo RI 14 246 41247
Collegiove RI 15 213 41460
Rocca Santo Stefano RM 15 975 42435
Monteflavio RM 15 1348 43783
Pisoniano RM 16 770 44553
Marcellina RM 16 7280 51833
Subiaco RM 16 9074 60907
Paganico Sabino RI 16 172 61079
Ascrea RI 17 234 61313
San Gregorio da Sassola RM 17 1619 62932
Casape RM 18 744 63676
San Vito Romano RM 18 3273 66949
Scandriglia RI 18 3108 70057
Bellegra RM 18 2887 72944
Tivoli RM 19 56533 129477
Sante Marie AQ 19 1166 130643
Montorio Romano RM 19 1984 132627
Palombara Sabina RM 19 13269 145896
Colle di Tora RI 19 372 146268
Castel di Tora RI 19 288 146556
Poli RM 19 2418 148974
Moricone RM 20 2650 151624
Affile RM 20 1548 153172
Poggio Moiano RI 20 2751 155923
Roiate RM 20 737 156660

Municipalities with at least 50000 inhabitants

An earthquake occurred to
19 Km NE of Tivoli (56533 inhabitants)
23 Km E of Guidonia Montecelio (88673 inhabitants)
44 Km NE of Velletri (53303 inhabitants)
45 Km E of Roma (2864731 inhabitants)
48 Km SW of L'Aquila (69753 inhabitants)
58 Km NE of Aprilia (73446 inhabitants)
58 Km NE of Pomezia (62966 inhabitants)
64 Km SE of Terni (111501 inhabitants)
65 Km N of Latina (125985 inhabitants)
70 Km E of Fiumicino (78395 inhabitants)
73 Km NE of Anzio (54211 inhabitants)
84 Km SE of Viterbo (67173 inhabitants)
90 Km SW of Teramo (54892 inhabitants)
99 Km E of Civitavecchia (52991 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 1.5 2021-10-16
00:22:59
42.0458 12.9943 3 2021-10-16
00:29:07
Sala Sismica INGV-Roma 96630321
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-10-16 00:22:59 ± 0.13
Latitude 42.0458 ± 0.0054
Longitude 12.9943 ± 0.0036
Depth (km) 3 ± 4 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 96630321

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 486
Semi-minor axis of confidence ellipse (meter) 427
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 188
Circular confidence region, given by single value of horizontal uncertainty (meter) 490
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 156
Number of associated phases, regardless of their use for origin computation 17
Number of defining phases 9
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.12
Epicentral distance of station closest to the epicenter (degree) 0
Epicentral distance of station farthest from the epicenter (degree) 0.5243
Number of stations at which the event was observed 10
Number of stations from which data was used for origin computation 5
Magnitude information

ML:1.5

Field Value
Value 1.5
Uncertainty 0.2
Num. used stations 12
Type of magnitude ML
Reference to an origin 96630321
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-10-16 00:29:07
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.LAV9.HHZ. 2021-10-16T00:23:17.07 3.0 undecidable manual S 0.429 1.42 0
IV.SRES.HHZ. 2021-10-16T00:23:16.27 3.0 undecidable manual S 298 0.4065 94 1.47 0
IV.GIUL.HHZ. 2021-10-16T00:23:16.73 3.0 undecidable manual S 0.5243 -2.19 0
IV.VIVA.HHZ. 2021-10-16T00:23:12.40 3.0 undecidable manual S -0.17 0
IV.PTQR.HHZ. 2021-10-16T00:23:10.93 0.6 undecidable manual S 94 0.3022 95 0.12 47
IV.ARRO.EHZ. 2021-10-16T00:23:10.03 3.0 positive manual P -0.71 0
IV.SAMA.EHZ. 2021-10-16T00:23:09.22 3.0 undecidable manual P 1.34 0
IV.SRES.HHZ. 2021-10-16T00:23:08.42 1.0 positive manual P 298 0.4065 94 0.25 22
IV.LAV9.HHZ. 2021-10-16T00:23:08.66 3.0 negative manual P 0.429 0 0
IV.GIUL.HHZ. 2021-10-16T00:23:08.77 3.0 negative manual P 0.5243 -1.78 0
IV.RCAV.EHZ. 2021-10-16T00:23:07.10 0.6 undecidable manual S 190 0.2014 97 0.15 48
IV.MTCE.HHZ. 2021-10-16T00:23:06.56 0.6 undecidable manual S 263 0.1889 98 0.12 48
IV.PTQR.HHZ. 2021-10-16T00:23:05.63 1.0 undecidable manual P 94 0.3022 95 -0.23 23
IV.MTCE.HHZ. 2021-10-16T00:23:03.19 0.3 negative manual P 263 0.1889 98 -0.15 72
IV.RCAV.EHZ. 2021-10-16T00:23:03.57 0.6 negative manual P 190 0.2014 97 -0.07 49
IV.CERT.HHZ. 2021-10-16T00:23:02.93 0.6 undecidable manual S 186 0.0971 105 -0.06 50
IV.CERT.HHZ. 2021-10-16T00:23:01.33 0.1 negative manual P 186 0.0971 105 -0.02 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.CERT.HHN. ML:1.7 0.000803 0.6 AML other m 2021-10-16T00:23:03.69
IV.CERT.HNN. ML:1.6 0.0006745 1 AML other m 2021-10-16T00:23:04.68
IV.CERT.HNE. ML:1.7 0.000863 0.94 AML other m 2021-10-16T00:23:04.66
IV.CERT.HHE. ML:1.3 0.0003645 0.68 AML other m 2021-10-16T00:23:04.68
IV.MTCE.HHN. ML:1.3 0.0001465 0.28 AML other m 2021-10-16T00:23:07.16
IV.MTCE.HHE. ML:1.2 0.0001275 0.92 AML other m 2021-10-16T00:23:07.75
IV.RCAV.EHE. ML:1.6 0.0002725 0.42 AML other m 2021-10-16T00:23:07.80
IV.RCAV.EHN. ML:1.5 0.000249 0.44 AML other m 2021-10-16T00:23:08.60
IV.PTQR.HHN. ML:1.1 5.505E-5 0.64 AML other m 2021-10-16T00:23:11.37
IV.PTQR.HHE. ML:1.2 6.565E-5 0.84 AML other m 2021-10-16T00:23:14.70
IV.VIVA.HHE. ML:1.7 0.0002065 0.42 AML other m 2021-10-16T00:23:15.26
IV.VIVA.HHN. ML:1.8 0.000252 1.1 AML other m 2021-10-16T00:23:18.13
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