Earthquake with magnitude of ML 1.2 on date 23-04-2021 and time 03:21:49 (Italy) in region 3 km SE Rocca Priora (RM)

A magnitude ML 1.2 earthquake occured in region: 3 km SE Rocca Priora (RM), on

  • 23-04-2021 01:21:49 (UTC)
  • 23-04-2021 03:21:49 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 41.7760, 12.7940 at 6 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.

Municipalities within 20 km from the epicenter

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Rocca Priora RM 3 11962 11962
San Cesareo RM 5 15153 27115
Monte Compatri RM 6 11978 39093
Lariano RM 6 13432 52525
Rocca di Papa RM 7 17034 69559
Colonna RM 8 4287 73846
Labico RM 8 6379 80225
Monte Porzio Catone RM 8 8693 88918
Zagarolo RM 8 17843 106761
Nemi RM 9 1943 108704
Frascati RM 10 22087 130791
Velletri RM 10 53303 184094
Valmontone RM 10 15959 200053
Grottaferrata RM 11 20327 220380
Palestrina RM 11 21672 242052
Artena RM 11 14276 256328
Gallicano nel Lazio RM 11 6334 262662
Marino RM 11 43026 305688
Genzano di Roma RM 11 23970 329658
Castel San Pietro Romano RM 12 902 330560
Ariccia RM 12 19407 349967
Castel Gandolfo RM 12 8997 358964
Albano Laziale RM 12 41715 400679
Cave RM 13 11287 411966
Lanuvio RM 13 13632 425598
Rocca di Cave RM 15 377 425975
Rocca Massima LT 15 1136 427111
Poli RM 15 2418 429529
Ciampino RM 16 38412 467941
Genazzano RM 16 6036 473977
Capranica Prenestina RM 16 351 474328
Casape RM 17 744 475072
San Gregorio da Sassola RM 17 1619 476691
Cori LT 18 11065 487756
Colleferro RM 18 21595 509351
San Vito Romano RM 20 3273 512624

Municipalities with at least 50000 inhabitants

An earthquake occurred to
10 Km N of Velletri (53303 inhabitants)
21 Km S of Tivoli (56533 inhabitants)
23 Km NE of Aprilia (73446 inhabitants)
26 Km S of Guidonia Montecelio (88673 inhabitants)
27 Km E of Pomezia (62966 inhabitants)
29 Km E of Roma (2864731 inhabitants)
35 Km N of Latina (125985 inhabitants)
39 Km NE of Anzio (54211 inhabitants)
46 Km E of Fiumicino (78395 inhabitants)
81 Km SW of L'Aquila (69753 inhabitants)
88 Km S of Terni (111501 inhabitants)
90 Km E of Civitavecchia (52991 inhabitants)
91 Km SE of Viterbo (67173 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 1.2 2021-04-23
01:21:49
41.7758 12.7937 7 2021-07-12
16:55:15
Bollettino Sismico Italiano INGV 91398411
Reviewed
Rev100
ML 1.2 2021-04-23
01:21:49
41.7777 12.8283 1 2021-04-23
01:27:20
Sala Sismica INGV-Roma 89379351
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-04-23 01:21:49 ± 0.16
Latitude 41.7758 ± 0.0054
Longitude 12.7937 ± 0.0060
Depth (km) 7 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 91398411

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 679
Semi-minor axis of confidence ellipse (meter) 198
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) 680.0
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 16
Number of defining phases 14
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.18
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.22213
Number of stations at which the event was observed 8
Number of stations from which data was used for origin computation 7
Magnitudes information

ML:1.2

Field Value
Value 1.2
Uncertainty 0.0
Num. used stations 2
Type of magnitude ML
Reference to an origin 91398411
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-06-16 13:43:53

ML:1.2

Field Value
Value 1.2
Uncertainty 0.0
Num. used stations 2
Type of magnitude ML
Reference to an origin 89379351
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-04-23 01:27:20
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.SEI.HHZ. 2021-04-23T01:22:58.99 3.0 undecidable manual Sn 0.34 0
IV.SEI.HHZ. 2021-04-23T01:22:23.91 3.0 undecidable manual Pn -0.95 0
IV.CERT.HNE. 2021-04-23T01:21:58.19 0.6 undecidable manual S 39 24.6531 105 -0.26 47
IV.RCAV.EHZ. 2021-04-23T01:21:55.41 0.6 undecidable manual S 58 14.7741 114 0.2 48
IV.CERT.HNE. 2021-04-23T01:21:54.35 0.6 undecidable manual P 39 24.6531 105 -0.35 46
IV.LAV9.HHZ. 2021-04-23T01:21:54.77 0.6 undecidable manual S 216 13.3755 116 0 50
IV.RCAV.EHZ. 2021-04-23T01:21:53.03 0.3 undecidable manual P 58 14.7741 114 0.2 72
IV.RDP.HHZ. 2021-04-23T01:21:53.04 0.6 undecidable manual S 256 7.0929 133 0.1 50
IV.MA9.HHN. 2021-04-23T01:21:53.71 0.6 undecidable manual S 267 11.1777 120 -0.36 47
IV.RMP.HHZ. 2021-04-23T01:21:53.50 0.6 undecidable manual S 299 8.3805 128 0.23 48
IV.LAV9.HHZ. 2021-04-23T01:21:52.67 0.3 undecidable manual P 216 13.3755 116 0.09 74
IV.MA9.HHN. 2021-04-23T01:21:52.01 0.3 undecidable manual P 267 11.1777 120 -0.17 73
IV.VIVA.HHZ. 2021-04-23T01:21:52.04 0.3 undecidable manual S 214 3.4965 152 -0.11 75
IV.RDP.HHZ. 2021-04-23T01:21:51.72 0.1 positive manual P 256 7.0929 133 0.2 98
IV.RMP.HHZ. 2021-04-23T01:21:51.84 0.3 undecidable manual P 299 8.3805 128 0.13 74
IV.VIVA.HHZ. 2021-04-23T01:21:50.95 0.1 negative manual P 214 3.4965 152 -0.12 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.RMP.HHE. ML:1.2 0.0002765 0.92 AML other m 2021-04-23T01:21:54.29
IV.RMP.HHN. ML:1.2 0.0002755 0.84 AML other m 2021-04-23T01:21:57.07
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