Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 2.1 on date 29-08-2020 and time 11:35:31 (UTC) in region 4 km NW Lariano (RM)

A magnitude ML 2.1 earthquake occured in region: 4 km NW Lariano (RM), on

  • 29-08-2020 11:35:31 (UTC)
  • 29-08-2020 13:35:31 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 41.7530, 12.7950 at 10 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
Lariano RM 4 13432 13432
Rocca Priora RM 5 11962 25394
Rocca di Papa RM 7 17034 42428
Velletri RM 7 53303 95731
Nemi RM 8 1943 97674
San Cesareo RM 8 15153 112827
Monte Compatri RM 8 11978 124805
Labico RM 9 6379 131184
Monte Porzio Catone RM 10 8693 139877
Colonna RM 10 4287 144164
Genzano di Roma RM 10 23970 168134
Zagarolo RM 10 17843 185977
Artena RM 10 14276 200253
Valmontone RM 11 15959 216212
Ariccia RM 11 19407 235619
Lanuvio RM 11 13632 249251
Frascati RM 11 22087 271338
Grottaferrata RM 11 20327 291665
Marino RM 11 43026 334691
Albano Laziale RM 12 41715 376406
Castel Gandolfo RM 12 8997 385403
Palestrina RM 13 21672 407075
Rocca Massima LT 13 1136 408211
Castel San Pietro Romano RM 13 902 409113
Gallicano nel Lazio RM 13 6334 415447
Cave RM 14 11287 426734
Cori LT 16 11065 437799
Rocca di Cave RM 16 377 438176
Ciampino RM 17 38412 476588
Poli RM 17 2418 479006
Genazzano RM 17 6036 485042
Colleferro RM 18 21595 506637
Cisterna di Latina LT 18 36868 543505
Capranica Prenestina RM 18 351 543856
Casape RM 19 744 544600
San Gregorio da Sassola RM 20 1619 546219

Municipalities with at least 50000 inhabitants

An earthquake occurred to
7 Km N of Velletri (53303 inhabitants)
21 Km NE of Aprilia (73446 inhabitants)
24 Km S of Tivoli (56533 inhabitants)
26 Km E of Pomezia (62966 inhabitants)
28 Km S of Guidonia Montecelio (88673 inhabitants)
30 Km SE of Roma (2864731 inhabitants)
33 Km N of Latina (125985 inhabitants)
37 Km NE of Anzio (54211 inhabitants)
46 Km E of Fiumicino (78395 inhabitants)
83 Km SW of L'Aquila (69753 inhabitants)
91 Km S of Terni (111501 inhabitants)
91 Km E of Civitavecchia (52991 inhabitants)
93 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 2.1 2020-08-29
11:35:31		 41.7527 12.7948 10 2020-11-19
12:37:02		 Bollettino Sismico Italiano INGV 83005561
Reviewed
Rev100 		ML 2.2 2020-08-29
11:35:31		 41.7778 12.7957 7 2020-08-29
11:50:50		 Sala Sismica INGV-Roma 82438051
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-08-29 11:35:31 ± 0.05
Latitude 41.7527 ± 0.0045
Longitude 12.7948 ± 0.0048
Depth (km) 10 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 83005561

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 446
Semi-minor axis of confidence ellipse (meter) 401
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 338
Circular confidence region, given by single value of horizontal uncertainty (meter) 450.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 70
Number of associated phases, regardless of their use for origin computation 24
Number of defining phases 24
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.2
Epicentral distance of station closest to the epicenter (degree) 0.01889
Epicentral distance of station farthest from the epicenter (degree) 0.59985
Number of stations at which the event was observed 13
Number of stations from which data was used for origin computation 13
Magnitudes information

ML:2.2

Field Value
Value 2.2
Uncertainty 0.3
Num. used stations 6
Type of magnitude ML
Reference to an origin 82438051
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-08-29 11:50:50

ML:2.1

Field Value
Value 2.1
Uncertainty 0.5
Num. used stations 14
Type of magnitude ML
Reference to an origin 83005561
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2020-11-15 01:53:56
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.GUAR.HHZ. 2020-08-29T11:35:45.56 0.6 undecidable manual S 84 43.0236 50 0.08 47
IV.GIUL.HHZ. 2020-08-29T11:35:45.76 0.6 undecidable manual S 119 43.8228 50 0.09 47
IT.RMVT.HGE. 2020-08-29T11:35:43.57 0.6 undecidable manual S 312 34.0437 50 0.5 44
IV.LRP.EHZ. 2020-08-29T11:35:43.14 0.3 undecidable manual P 100 66.5778 50 0.03 68
IV.LATB.EHZ. 2020-08-29T11:35:42.43 0.3 undecidable manual S 154 31.9458 50 -0.07 72
IV.GIUL.HHZ. 2020-08-29T11:35:39.38 0.1 undecidable manual P 119 43.8228 50 -0.21 91
IV.GUAR.HHZ. 2020-08-29T11:35:39.27 0.6 undecidable manual P 84 43.0236 50 -0.21 46
IV.RCAV.EHE. 2020-08-29T11:35:38.06 0.3 undecidable manual S 50 16.2726 121 0.16 73
IV.SAMA.EHZ. 2020-08-29T11:35:38.05 0.3 undecidable manual S 280 17.0718 120 -0.07 74
IV.LATB.EHZ. 2020-08-29T11:35:37.54 0.3 undecidable manual P 154 31.9458 50 -0.22 70
IV.MTCE.HHE. 2020-08-29T11:35:37.29 0.6 undecidable manual P 352 30.2475 50 -0.22 47
IT.RMVT.HGE. 2020-08-29T11:35:37.84 0.6 undecidable manual P 312 34.0437 50 -0.25 46
IV.LAV9.HHZ. 2020-08-29T11:35:36.75 0.6 undecidable manual S 224 11.4774 131 0.2 48
IV.MA9.HHE. 2020-08-29T11:35:36.13 0.3 undecidable manual S 280 11.3775 131 -0.4 70
IV.RCAV.EHE. 2020-08-29T11:35:35.10 0.1 undecidable manual P 50 16.2726 121 0 100
IV.RDP.HHZ. 2020-08-29T11:35:35.26 0.3 undecidable manual S 277 7.0929 145 -0.25 72
IV.SAMA.EHZ. 2020-08-29T11:35:35.35 0.3 undecidable manual P 280 17.0718 120 0.12 73
IV.RMP.HHN. 2020-08-29T11:35:35.93 0.3 undecidable manual S 311 9.879 135 -0.22 72
IV.MA9.HHE. 2020-08-29T11:35:34.49 0.3 undecidable manual P 280 11.3775 131 0.18 73
IV.LAV9.HHZ. 2020-08-29T11:35:34.74 0.3 undecidable manual P 224 11.4774 131 0.41 69
IV.RDP.HHZ. 2020-08-29T11:35:34.00 0.1 negative manual P 277 7.0929 145 0.28 96
IV.RMP.HHN. 2020-08-29T11:35:34.31 0.6 undecidable manual P 311 9.879 135 0.22 48
IV.VIVA.HHZ. 2020-08-29T11:35:34.49 0.6 undecidable manual S 262 2.0979 168 -0.32 48
IV.VIVA.HHZ. 2020-08-29T11:35:33.43 0.1 negative manual P 262 2.0979 168 0.12 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.VIVA.HHN. ML:3.2 0.02798122 0.16 AML other m 2020-08-29T11:35:34.56
IV.VIVA.HHE. ML:2.8 0.0121778 0.1792 AML other m 2020-08-29T11:35:35.03
IV.RDP.HHE. ML:2.7 0.007734861500000001 0.3456 AML other m 2020-08-29T11:35:36.24
IV.RDP.HHN. ML:2.7 0.007495222 0.1792 AML other m 2020-08-29T11:35:36.21
IV.LAV9.HHN. ML:2.4 0.002615277 0.2432 AML other m 2020-08-29T11:35:37.93
IV.LAV9.HNN. ML:2.3 0.002429156 0.2432 AML other m 2020-08-29T11:35:37.94
IV.LAV9.HNE. ML:2.2 0.0018165274999999998 0.1408 AML other m 2020-08-29T11:35:38.01
IV.LAV9.HHE. ML:2.2 0.00203117 0.2816 AML other m 2020-08-29T11:35:38.51
IV.LATB.EHN. ML:0.9 0.00003438586 0.2048 AML other m 2020-08-29T11:35:42.68
IV.LATB.EHE. ML:0.9 0.00003262325500000001 0.16 AML other m 2020-08-29T11:35:43.41
IV.GUAR.HHE. ML:1.8 0.00018546079999999998 0.4032 AML other m 2020-08-29T11:35:46.94
IV.GUAR.HHN. ML:1.8 0.0001997503 0.384 AML other m 2020-08-29T11:35:48.40
IV.LRP.EHN. ML:1.2 0.00002483505 0.3776 AML other m 2020-08-29T11:35:54.25
IV.LRP.EHE. ML:1.8 0.000099817685 0.1984 AML other m 2020-08-29T11:35:54.65
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
Waveforms Seismic signals in miniseed + resp format Download