Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.4 on date 21-09-2020 and time 15:42:35 (Italy) in region 3 km E Leonessa (RI)

A magnitude ML 1.4 earthquake occured in region: 3 km E Leonessa (RI), on

  • 21-09-2020 13:42:35 (UTC)
  • 21-09-2020 15:42:35 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.5640, 13.0010 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
Monteleone di Spoleto PG 11 599 3728
Poggio Bustone RI 12 2055 5783
Borbona RI 12 617 6400
Rivodutri RI 13 1253 7653
Polino TR 13 233 7886
Cantalice RI 13 2755 10641
Micigliano RI 13 127 10768
Morro Reatino RI 14 373 11141
Cittareale RI 14 482 11623
Labro RI 17 374 11997
Cascia PG 17 3217 15214
Poggiodomo PG 17 117 15331
Antrodoco RI 17 2588 17919
Borgo Velino RI 18 972 18891
Ferentillo TR 18 1913 20804
Castel Sant'Angelo RI 19 1308 22112
Arrone TR 19 2763 24875
Colli sul Velino RI 19 533 25408
Montefranco TR 20 1276 26684
Cittaducale RI 20 6828 33512

Municipalities with at least 50000 inhabitants

An earthquake occurred to
29 Km E of Terni (111501 inhabitants)
40 Km NW of L'Aquila (69753 inhabitants)
50 Km SE of Foligno (57155 inhabitants)
59 Km W of Teramo (54892 inhabitants)
67 Km NE of Guidonia Montecelio (88673 inhabitants)
69 Km N of Tivoli (56533 inhabitants)
75 Km E of Viterbo (67173 inhabitants)
78 Km SE of Perugia (166134 inhabitants)
86 Km NE of Roma (2864731 inhabitants)
94 Km W of Montesilvano (53738 inhabitants)
99 Km W of Chieti (51815 inhabitants)
99 Km N of Velletri (53303 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 1.4 2020-09-21
13:42:35		 42.5637 13.0008 11 2021-02-26
14:55:56		 Bollettino Sismico Italiano INGV 83155361
Reviewed
Rev100 		ML 1.6 2020-09-21
13:42:35		 42.5787 13.0068 12 2020-09-21
13:50:58		 Sala Sismica INGV-Roma 83105261
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-09-21 13:42:35 ± 0.1
Latitude 42.5637 ± 0.0072
Longitude 13.0008 ± 0.0061
Depth (km) 11 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 83155361

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 831
Semi-minor axis of confidence ellipse (meter) 348
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 204
Circular confidence region, given by single value of horizontal uncertainty (meter) 830.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 166
Number of associated phases, regardless of their use for origin computation 43
Number of defining phases 22
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.25
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.44696
Number of stations at which the event was observed 31
Number of stations from which data was used for origin computation 11
Magnitudes information

ML:1.6

Field Value
Value 1.6
Uncertainty 0.7
Num. used stations 16
Type of magnitude ML
Reference to an origin 83105261
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-09-21 13:50:58

ML:1.4

Field Value
Value 1.4
Uncertainty 0.2
Num. used stations 16
Type of magnitude ML
Reference to an origin 83155361
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2020-12-15 14:49:26
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
XK.GIZZ.HHZ. 2020-09-21T13:44:32.80 3.0 undecidable manual Sn -2.47 0
IV.ORI.HHZ. 2020-09-21T13:44:30.93 3.0 undecidable manual Sg 13.01 0
CR.ZAG.BHZ. 2020-09-21T13:44:26.30 3.0 undecidable manual Sn 0.07 0
GU.BLANC.HHZ. 2020-09-21T13:44:15.48 3.0 undecidable manual Pg 16.309999 0
IV.CADC.HNZ. 2020-09-21T13:44:15.42 3.0 undecidable manual Sn -1.98 0
GU.LSD.HHZ. 2020-09-21T13:44:14.70 3.0 negative manual Pg 20.09 0
IV.HLNI.HHZ. 2020-09-21T13:44:06.13 3.0 undecidable manual Pg 8.31 0
IV.TEOL.HHZ. 2020-09-21T13:44:03.68 3.0 undecidable manual Sg 0.77 0
MN.TIR.HHZ. 2020-09-21T13:44:02.44 3.0 negative manual Pn 6.06 0
CH.DIX.HHZ. 2020-09-21T13:43:55.47 3.0 undecidable manual Pn -2.04 0
IV.SENA.HHZ. 2020-09-21T13:43:41.49 3.0 undecidable manual Pg 11.13 0
CR.ZAG.BHZ. 2020-09-21T13:43:39.50 3.0 positive manual Pn 1.38 0
OX.ACOM.HHZ. 2020-09-21T13:43:37.03 3.0 undecidable manual Pn -2.39 0
IV.AGLI.HHZ. 2020-09-21T13:43:24.65 3.0 undecidable manual Pn -3.01 0
IV.MCRV.HHZ. 2020-09-21T13:43:20.73 3.0 undecidable manual Pg 3.84 0
IV.FIR.HHZ. 2020-09-21T13:43:10.17 3.0 undecidable manual Pg 1.75 0
TV.SF04.EHZ. 2020-09-21T13:43:09.71 3.0 undecidable manual S -4.43 0
IV.RIBO.EHZ.01 2020-09-21T13:43:05.86 3.0 undecidable manual Pg 1.36 0
IV.ROSPO.HHZ. 2020-09-21T13:43:01.68 3.0 undecidable manual P -2.56 0
IV.CESI.HHE. 2020-09-21T13:42:51.38 0.6 undecidable manual S 351 49.617 50 -0.14 46
IV.MMO1.EHN. 2020-09-21T13:42:50.23 0.6 undecidable manual S 35 45.7209 50 -0.27 45
IV.MOMA.HNZ. 2020-09-21T13:42:50.39 0.6 undecidable manual S 307 44.1225 50 0.33 45
IV.MC2.EHZ. 2020-09-21T13:42:49.85 0.6 undecidable manual S 22 41.5251 50 0.48 44
IV.MNTT.EHZ. 2020-09-21T13:42:49.10 3.0 undecidable manual P 0.77 0
IV.CAMP.HHE. 2020-09-21T13:42:47.08 0.6 undecidable manual S 95 33.5442 50 -0.15 48
IT.MTCL.HGZ. 2020-09-21T13:42:45.10 3.0 undecidable manual P 0.69 0
IV.SMA1.EHZ. 2020-09-21T13:42:45.62 0.3 undecidable manual S 75 28.3494 50 -0.22 71
IV.CESI.HHE. 2020-09-21T13:42:44.67 0.1 undecidable manual P 351 49.617 50 -0.19 92
IV.T1299.HNN. 2020-09-21T13:42:44.46 0.6 undecidable manual S 71 24.2535 50 -0.31 47
IV.MMO1.EHN. 2020-09-21T13:42:44.57 0.3 undecidable manual P 35 45.7209 50 0.3 68
IV.MOMA.HNZ. 2020-09-21T13:42:44.16 0.3 undecidable manual P 307 44.1225 50 0.15 70
IV.MC2.EHZ. 2020-09-21T13:42:44.28 0.3 undecidable manual P 22 41.5251 50 0.67 61
IV.RM33.EHZ. 2020-09-21T13:42:43.13 0.1 undecidable manual S 109 18.4704 120 -0.04 100
IV.CAMP.HHE. 2020-09-21T13:42:42.19 0.1 undecidable manual P 95 33.5442 50 -0.19 95
IV.ARRO.EHZ. 2020-09-21T13:42:42.94 0.6 undecidable manual S 275 19.2696 119 -0.47 46
IV.GAVE.EHZ. 2020-09-21T13:42:42.16 0.1 undecidable manual S 329 16.6722 123 -0.48 91
IV.SMA1.EHZ. 2020-09-21T13:42:41.53 0.1 positive manual P 75 28.3494 50 -0.05 98
IV.T1299.HNN. 2020-09-21T13:42:40.88 0.3 undecidable manual P 71 24.2535 50 -0.08 74
IV.RM33.EHZ. 2020-09-21T13:42:40.09 0.1 positive manual P 109 18.4704 120 0.05 100
IV.LNSS.HHZ. 2020-09-21T13:42:40.08 0.1 undecidable manual S 37 5.3946 153 0.16 100
IV.ARRO.EHZ. 2020-09-21T13:42:40.35 0.1 undecidable manual P 275 19.2696 119 0.18 97
IV.GAVE.EHZ. 2020-09-21T13:42:39.67 0.1 undecidable manual P 329 16.6722 123 -0.06 100
IV.LNSS.HHZ. 2020-09-21T13:42:38.46 0.1 undecidable manual P 37 5.3946 153 0.3 97
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.LNSS.HHE. ML:1.7 0.0007497136500000001 0.1024 AML other m 2020-09-21T13:42:40.27
IV.LNSS.HNE. ML:1.6 0.0006692218 0.1216 AML other m 2020-09-21T13:42:40.27
IV.LNSS.HNN. ML:1.4 0.00040730765000000004 0.2368 AML other m 2020-09-21T13:42:40.73
IV.LNSS.HHN. ML:1.5 0.0005071401 0.1408 AML other m 2020-09-21T13:42:40.73
IV.GAVE.EHE. ML:1.6 0.00030079395 0.1792 AML other m 2020-09-21T13:42:42.47
IV.GAVE.EHN. ML:1.4 0.00022388745 0.2176 AML other m 2020-09-21T13:42:42.52
IV.GAVE.HNE. ML:1.6 0.0003348403 0.576 AML other m 2020-09-21T13:42:43.21
IV.ARRO.EHE. ML:1.2 0.0001186552 0.1856 AML other m 2020-09-21T13:42:43.62
IV.RM33.EHE. ML:1.2 0.00011818729999999999 0.16 AML other m 2020-09-21T13:42:43.89
IV.RM33.HNN. ML:1.3 0.0001658774 0.2688 AML other m 2020-09-21T13:42:44.20
IV.RM33.EHN. ML:1.3 0.00014729665 0.2624 AML other m 2020-09-21T13:42:44.06
IV.ARRO.EHN. ML:1.4 0.00016893315000000001 0.1792 AML other m 2020-09-21T13:42:44.20
IV.RM33.HNE. ML:1.3 0.00014828094999999998 0.352 AML other m 2020-09-21T13:42:44.90
IV.SMA1.EHN. ML:1.4 0.00014408715 0.3008 AML other m 2020-09-21T13:42:45.97
IV.SMA1.EHE. ML:1.4 0.000113342255 0.16 AML other m 2020-09-21T13:42:46.16
IV.GAVE.HNN. ML:1.4 0.00019425265 1.4016 AML other m 2020-09-21T13:42:48.16
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