Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.6 on date 23-07-2021 and time 07:42:59 (UTC) in region 3 km SE Leonessa (RI)

A magnitude ML 1.6 earthquake occured in region: 3 km SE Leonessa (RI), on

  • 23-07-2021 07:42:59 (UTC)
  • 23-07-2021 09:42:59 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.5470, 12.9940 at 11 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
Leonessa RI 3 2435 2435
Posta RI 9 694 3129
Poggio Bustone RI 10 2055 5184
Cantalice RI 11 2755 7939
Micigliano RI 12 127 8066
Rivodutri RI 12 1253 9319
Borbona RI 12 617 9936
Monteleone di Spoleto PG 12 599 10535
Polino TR 13 233 10768
Morro Reatino RI 13 373 11141
Cittareale RI 16 482 11623
Labro RI 16 374 11997
Antrodoco RI 16 2588 14585
Borgo Velino RI 17 972 15557
Castel Sant'Angelo RI 17 1308 16865
Cittaducale RI 18 6828 23693
Colli sul Velino RI 18 533 24226
Ferentillo TR 19 1913 26139
Arrone TR 19 2763 28902
Rieti RI 19 47698 76600
Poggiodomo PG 19 117 76717
Cascia PG 19 3217 79934
Montefranco TR 19 1276 81210

Municipalities with at least 50000 inhabitants

An earthquake occurred to
28 Km E of Terni (111501 inhabitants)
40 Km NW of L'Aquila (69753 inhabitants)
51 Km SE of Foligno (57155 inhabitants)
60 Km W of Teramo (54892 inhabitants)
65 Km NE of Guidonia Montecelio (88673 inhabitants)
67 Km N of Tivoli (56533 inhabitants)
74 Km E of Viterbo (67173 inhabitants)
80 Km SE of Perugia (166134 inhabitants)
84 Km NE of Roma (2864731 inhabitants)
95 Km W of Montesilvano (53738 inhabitants)
97 Km N of Velletri (53303 inhabitants)
99 Km W of Chieti (51815 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 1.6 2021-07-23
07:42:59		 42.547 12.9938 11 2021-12-29
11:12:51		 Bollettino Sismico Italiano INGV 97364401
Reviewed
Rev100 		ML 1.6 2021-07-23
07:42:59		 42.5508 12.993 13 2021-07-23
07:49:50		 Sala Sismica INGV-Roma 93096871
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-07-23 07:42:59 ± 0.05
Latitude 42.5470 ± 0.0000
Longitude 12.9938 ± 0.0037
Depth (km) 11 (operator assigned)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 97364401

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 300
Semi-minor axis of confidence ellipse (meter) 250
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 359
Circular confidence region, given by single value of horizontal uncertainty (meter) 250.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 119
Number of associated phases, regardless of their use for origin computation 44
Number of defining phases 44
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.24
Epicentral distance of station closest to the epicenter (degree) 0.06565
Epicentral distance of station farthest from the epicenter (degree) 0.78601
Number of stations at which the event was observed 22
Number of stations from which data was used for origin computation 22
Magnitudes information

ML:1.6

Field Value
Value 1.6
Uncertainty 0.2
Num. used stations 26
Type of magnitude ML
Reference to an origin 93096871
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-07-23 07:49:50

ML:1.6

Field Value
Value 1.6
Uncertainty 0.2
Num. used stations 26
Type of magnitude ML
Reference to an origin 97364401
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-11-09 14:55:42
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.EL6.EHZ. 2021-07-23T07:43:26.67 0.6 undecidable manual S 6 87.246 90 1.29 28
IV.CSP1.EHZ. 2021-07-23T07:43:19.45 0.3 undecidable manual S 16 62.7927 90 0.6 60
IV.MML1.EHZ. 2021-07-23T07:43:19.20 0.3 undecidable manual S 358 62.8926 90 0.33 65
IV.ASSB.HHZ. 2021-07-23T07:43:18.70 0.6 undecidable manual S 334 61.3941 90 0.22 44
IV.FDMO.HHZ. 2021-07-23T07:43:16.92 0.3 undecidable manual S 8 54.8007 90 0.2 68
IV.CESI.HHE. 2021-07-23T07:43:15.83 0.6 undecidable manual S 352 51.3153 90 0.04 47
IV.TERO.HHZ. 2021-07-23T07:43:15.17 0.6 undecidable manual S 80 50.5161 90 -0.41 43
IV.MMO1.EHZ. 2021-07-23T07:43:14.99 0.6 undecidable manual S 35 47.619 90 0.2 46
IT.GNU.HGE. 2021-07-23T07:43:14.95 0.6 undecidable manual S 310 44.8218 90 0.91 35
IV.MC2.EHZ. 2021-07-23T07:43:14.04 0.3 undecidable manual S 21 43.4232 90 0.35 67
IV.MOMA.HHZ. 2021-07-23T07:43:14.37 0.6 undecidable manual S 310 44.8218 90 0.33 44
IV.EL6.EHZ. 2021-07-23T07:43:14.58 0.3 undecidable manual P 6 87.246 90 0.08 65
IV.MTRA.EHZ. 2021-07-23T07:43:12.37 0.3 undecidable manual S 55 40.2264 90 -0.47 65
IV.CAMP.HHE. 2021-07-23T07:43:11.12 0.6 undecidable manual S 92 33.9438 90 -0.03 48
IV.CESX.HHZ. 2021-07-23T07:43:11.20 0.6 undecidable manual S 282 33.9438 90 0.05 48
IV.CSP1.EHZ. 2021-07-23T07:43:10.66 0.3 undecidable manual P 16 62.7927 90 -0.07 69
IV.MML1.EHZ. 2021-07-23T07:43:10.64 0.1 undecidable manual P 358 62.8926 90 -0.1 92
IV.NRCA.HHZ. 2021-07-23T07:43:10.35 0.3 undecidable manual S 17 33.2445 90 -0.62 63
IV.FIAM.HHZ. 2021-07-23T07:43:10.86 0.3 undecidable manual S 162 32.5452 90 0.08 73
IV.ASSB.HHZ. 2021-07-23T07:43:10.27 0.3 undecidable manual P 334 61.3941 90 -0.24 67
IV.SMA1.EHZ. 2021-07-23T07:43:09.78 0.3 undecidable manual S 72 29.3484 90 -0.15 71
IV.FDMO.HHZ. 2021-07-23T07:43:09.31 0.1 undecidable manual P 8 54.8007 90 -0.19 91
IV.TERO.HHZ. 2021-07-23T07:43:08.76 0.3 undecidable manual P 80 50.5161 90 -0.08 70
IT.GNU.HGE. 2021-07-23T07:43:08.12 0.3 undecidable manual P 310 44.8218 90 0.17 69
IV.CESI.HHE. 2021-07-23T07:43:08.96 0.3 undecidable manual P 352 51.3153 90 0 71
IV.T1299.HNN. 2021-07-23T07:43:08.79 0.6 undecidable manual S 68 25.4523 90 -0.1 48
IV.MOMA.HHZ. 2021-07-23T07:43:07.76 0.1 undecidable manual P 310 44.8218 90 -0.19 94
IV.MMO1.EHZ. 2021-07-23T07:43:07.95 0.3 undecidable manual P 35 47.619 90 -0.44 66
IV.RM33.EHZ. 2021-07-23T07:43:07.07 0.6 undecidable manual S 103 18.5703 90 0.04 50
IV.MC2.EHZ. 2021-07-23T07:43:07.63 0.1 undecidable manual P 21 43.4232 90 -0.11 95
IV.ARRO.EHZ. 2021-07-23T07:43:07.14 0.6 undecidable manual S 281 18.9699 90 -0.01 50
IV.FIAM.HHZ. 2021-07-23T07:43:06.16 0.3 undecidable manual P 162 32.5452 90 0.09 72
IV.CAMP.HHE. 2021-07-23T07:43:06.45 0.6 undecidable manual P 92 33.9438 90 0.17 48
IV.CESX.HHZ. 2021-07-23T07:43:06.23 0.3 undecidable manual P 282 33.9438 90 -0.05 73
IV.GAVE.EHZ. 2021-07-23T07:43:06.54 0.6 undecidable manual S 333 18.0708 90 -0.37 47
IV.MTRA.EHZ. 2021-07-23T07:43:06.97 0.1 undecidable manual P 55 40.2264 90 -0.28 91
IV.T1299.HNN. 2021-07-23T07:43:05.03 0.1 undecidable manual P 68 25.4523 90 0.05 99
IV.SMA1.EHZ. 2021-07-23T07:43:05.67 0.1 undecidable manual P 72 29.3484 90 0.09 98
IV.NRCA.HHZ. 2021-07-23T07:43:05.81 0.1 positive manual P 17 33.2445 90 -0.37 91
IV.RM33.EHZ. 2021-07-23T07:43:04.01 0.1 undecidable manual P 103 18.5703 90 0.1 99
IV.LNSS.HHZ. 2021-07-23T07:43:04.38 0.3 undecidable manual S 32 7.2927 135 0.15 75
IV.ARRO.EHZ. 2021-07-23T07:43:04.05 0.1 undecidable manual P 281 18.9699 90 0.08 98
IV.GAVE.EHZ. 2021-07-23T07:43:03.73 0.1 negative manual P 333 18.0708 90 -0.1 100
IV.LNSS.HHZ. 2021-07-23T07:43:02.54 0.1 undecidable manual P 32 7.2927 135 0.25 98
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.LNSS.HHE. ML:2.2 0.0020099999999999996 0.14 AML other m 2021-07-23T07:43:04.58
IV.LNSS.HHN. ML:2.0 0.001545 0.16 AML other m 2021-07-23T07:43:04.61
IV.GAVE.EHN. ML:1.8 0.0004715 0.24 AML other m 2021-07-23T07:43:07.38
IV.ARRO.EHN. ML:1.4 0.00020600000000000002 0.12 AML other m 2021-07-23T07:43:07.28
IV.RM33.EHN. ML:1.5 0.0002275 0.26 AML other m 2021-07-23T07:43:07.34
IV.GAVE.EHE. ML:1.8 0.000513 1.02 AML other m 2021-07-23T07:43:07.56
IV.ARRO.EHE. ML:1.6 0.00028100000000000005 0.18 AML other m 2021-07-23T07:43:08.75
IV.RM33.EHE. ML:1.4 0.00021250000000000002 1.76 AML other m 2021-07-23T07:43:09.01
IV.SMA1.EHN. ML:1.9 0.0003755 0.34 AML other m 2021-07-23T07:43:10.32
IV.NRCA.HHN. ML:1.6 0.0001875 0.72 AML other m 2021-07-23T07:43:10.87
IV.SMA1.EHE. ML:1.6 0.00021500000000000002 0.88 AML other m 2021-07-23T07:43:10.32
IV.NRCA.HHE. ML:1.7 0.00022250000000000001 0.94 AML other m 2021-07-23T07:43:10.50
IV.FIAM.HHE. ML:0.9 0.0000337 0.32 AML other m 2021-07-23T07:43:11.40
IV.CESX.HHE. ML:1.2 0.00006065 0.66 AML other m 2021-07-23T07:43:11.66
IV.CESX.HHN. ML:1.3 0.0000739 1.82 AML other m 2021-07-23T07:43:11.99
IV.FIAM.HHN. ML:1.0 0.00004365 0.12 AML other m 2021-07-23T07:43:12.07
IV.MTRA.EHN. ML:1.6 0.0001515 1.64 AML other m 2021-07-23T07:43:12.88
IV.MTRA.EHE. ML:1.8 0.000189 1.56 AML other m 2021-07-23T07:43:13.88
IV.MOMA.HHE. ML:1.5 0.0000958 0.2 AML other m 2021-07-23T07:43:15.13
IV.MOMA.HHN. ML:1.6 0.00011149999999999999 0.22 AML other m 2021-07-23T07:43:15.26
IV.FDMO.HHN. ML:1.3 0.00004775 0.48 AML other m 2021-07-23T07:43:17.23
IV.FDMO.HHE. ML:1.4 0.00005815 0.16 AML other m 2021-07-23T07:43:17.63
IV.MML1.EHN. ML:1.6 0.00007295 0.62 AML other m 2021-07-23T07:43:19.97
IV.ASSB.HHN. ML:1.5 0.0000632 1.34 AML other m 2021-07-23T07:43:20.06
IV.MML1.EHE. ML:1.6 0.0000776 0.18 AML other m 2021-07-23T07:43:20.28
IV.ASSB.HHE. ML:1.4 0.000043950000000000004 0.78 AML other m 2021-07-23T07:43:20.43
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