Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.7 on date 04-09-2020 and time 13:16:41 (Italy) in region 5 km NW Accumoli (RI)

A magnitude ML 1.7 earthquake occured in region: 5 km NW Accumoli (RI), on

  • 04-09-2020 11:16:41 (UTC)
  • 04-09-2020 13:16:41 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.7270, 13.2060 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
Accumoli RI 5 667 667
Arquata del Tronto AP 9 1178 1845
Norcia PG 12 4957 6802
Cittareale RI 13 482 7284
Amatrice RI 13 2657 9941
Cascia PG 16 3217 13158
Montegallo AP 17 523 13681
Acquasanta Terme AP 17 2916 16597
Castelsantangelo sul Nera MC 19 281 16878

Municipalities with at least 50000 inhabitants

An earthquake occurred to
42 Km W of Teramo (54892 inhabitants)
45 Km NW of L'Aquila (69753 inhabitants)
48 Km SE of Foligno (57155 inhabitants)
49 Km E of Terni (111501 inhabitants)
79 Km SE of Perugia (166134 inhabitants)
81 Km W of Montesilvano (53738 inhabitants)
88 Km W of Pescara (121014 inhabitants)
89 Km W of Chieti (51815 inhabitants)
90 Km NE of Guidonia Montecelio (88673 inhabitants)
91 Km NE of Tivoli (56533 inhabitants)
96 Km E 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 1.7 2020-09-04
11:16:41		 42.7267 13.2063 10 2021-02-26
14:56:05		 Bollettino Sismico Italiano INGV 84688561
Reviewed
Rev100 		ML 1.6 2020-09-04
11:16:41		 42.7252 13.2107 10 2020-09-04
11:24:41		 Sala Sismica INGV-Roma 82617861
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-09-04 11:16:41 ± 0.05
Latitude 42.7267 ± 0.0027
Longitude 13.2063 ± 0.0049
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 84688561

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 359
Semi-minor axis of confidence ellipse (meter) 246
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 97
Circular confidence region, given by single value of horizontal uncertainty (meter) 360.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 47
Number of associated phases, regardless of their use for origin computation 38
Number of defining phases 37
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) 0.60704
Number of stations at which the event was observed 24
Number of stations from which data was used for origin computation 23
Magnitudes information

ML:1.6

Field Value
Value 1.6
Uncertainty 0.3
Num. used stations 28
Type of magnitude ML
Reference to an origin 82617861
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-09-04 11:24:41

ML:1.7

Field Value
Value 1.7
Uncertainty 0.3
Num. used stations 30
Type of magnitude ML
Reference to an origin 84688561
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2020-11-13 09:19:12
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.VIVA.HHZ. 2020-09-04T11:16:58.46 3.0 positive manual P -0.5 0
IV.MML1.HNE. 2020-09-04T11:16:57.49 0.3 undecidable manual S 336 46.9197 50 0.23 68
IV.CESI.HHZ. 2020-09-04T11:16:55.23 0.6 undecidable manual S 322 39.4272 50 -0.02 48
IV.GUMA.HHZ. 2020-09-04T11:16:55.48 0.3 undecidable manual S 16 38.7279 50 0.42 66
IV.MF5.EHZ. 2020-09-04T11:16:55.00 0.6 undecidable manual S 35 35.5422 50 0.79 39
IV.CSP1.EHZ. 2020-09-04T11:16:55.38 0.3 undecidable manual S 360 40.5261 50 -0.16 70
IV.TERO.HHZ. 2020-09-04T11:16:53.43 0.3 undecidable manual S 109 34.4433 50 -0.48 66
IV.FDMO.HHZ. 2020-09-04T11:16:53.97 0.3 undecidable manual S 344 35.742 50 -0.29 68
IV.EL6.EHZ. 2020-09-04T11:16:53.81 0.1 undecidable manual P 353 67.377 50 -0.12 89
IV.ASSB.HHZ. 2020-09-04T11:16:52.28 0.3 undecidable manual P 308 56.6988 50 0.01 70
IV.MNTT.EHZ. 2020-09-04T11:16:51.76 0.1 undecidable manual P 40 48.8178 50 0.7 79
IV.OFFI.HHZ. 2020-09-04T11:16:51.08 0.1 undecidable manual P 59 45.3213 50 0.55 84
IV.GAVE.EHZ. 2020-09-04T11:16:51.33 0.3 undecidable manual S 262 25.752 110 -0.11 72
IV.MML1.HNE. 2020-09-04T11:16:50.62 0.3 undecidable manual P 336 46.9197 50 -0.16 69
IV.MC2.EHZ. 2020-09-04T11:16:50.07 0.3 undecidable manual S 356 20.5683 115 0.3 70
IV.RM33.EHZ. 2020-09-04T11:16:50.86 0.3 undecidable manual S 178 24.1536 111 -0.07 73
IV.MF5.EHZ. 2020-09-04T11:16:49.19 0.1 undecidable manual P 35 35.5422 50 0.17 94
IV.ARRO.EHZ. 2020-09-04T11:16:49.69 0.1 undecidable manual P 246 39.5271 50 0.06 95
IV.MMO1.EHZ. 2020-09-04T11:16:49.79 0.3 undecidable manual S 27 21.5673 114 -0.29 70
IV.CSP1.EHZ. 2020-09-04T11:16:49.45 0.1 positive manual P 360 40.5261 50 -0.33 90
IV.CESI.HHZ. 2020-09-04T11:16:49.47 0.1 undecidable manual P 322 39.4272 50 -0.15 93
IV.GUMA.HHZ. 2020-09-04T11:16:49.53 0.1 positive manual P 16 38.7279 50 0.03 96
IV.LNSS.HHZ. 2020-09-04T11:16:49.51 0.3 undecidable manual S 225 19.2696 116 0.13 73
IT.MTCL.HGZ. 2020-09-04T11:16:48.48 0.1 undecidable manual P 330 34.0437 50 -0.31 91
IV.TERO.HHZ. 2020-09-04T11:16:48.54 0.1 undecidable manual P 109 34.4433 50 -0.3 91
IV.FDMO.HHZ. 2020-09-04T11:16:48.74 0.1 undecidable manual P 344 35.742 50 -0.3 91
IV.RM33.EHZ. 2020-09-04T11:16:47.08 0.1 positive manual P 178 24.1536 111 -0.04 98
IV.GAVE.EHZ. 2020-09-04T11:16:47.36 0.1 positive manual P 262 25.752 110 -0.05 98
IV.MTRA.HNZ. 2020-09-04T11:16:47.99 0.1 undecidable manual S 78 15.873 121 -0.34 94
IV.NRCA.HNZ. 2020-09-04T11:16:47.75 0.1 undecidable manual S 328 14.0748 124 -0.05 100
IV.CAMP.HHE. 2020-09-04T11:16:47.53 0.3 undecidable manual P 142 26.8509 109 -0.1 72
IV.LNSS.HHZ. 2020-09-04T11:16:46.43 0.1 positive manual P 225 19.2696 116 0.2 96
IV.MMO1.EHZ. 2020-09-04T11:16:46.46 0.1 positive manual P 27 21.5673 114 -0.17 96
IV.MC2.EHZ. 2020-09-04T11:16:46.47 0.1 positive manual P 356 20.5683 115 0.02 99
IV.MTRA.HNZ. 2020-09-04T11:16:45.60 0.1 positive manual P 78 15.873 121 -0.02 100
IV.NRCA.HNZ. 2020-09-04T11:16:45.47 0.1 negative manual P 328 14.0748 124 0.16 97
IV.SMA1.EHZ. 2020-09-04T11:16:45.88 0.3 undecidable manual P 135 14.9739 122 0.41 69
IV.T1299.HNN. 2020-09-04T11:16:45.19 0.3 undecidable manual P 149 11.9769 128 0.21 73
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.NRCA.HHN. ML:1.9 0.000892 0.16 AML other m 2020-09-04T11:16:47.85
IV.NRCA.HHE. ML:2.4 0.0025549999999999995 0.12 AML other m 2020-09-04T11:16:47.90
IV.MTRA.EHN. ML:1.5 0.000319 0.26 AML other m 2020-09-04T11:16:48.08
IV.MTRA.EHE. ML:1.6 0.00036899999999999997 0.5 AML other m 2020-09-04T11:16:49.34
IV.LNSS.HHE. ML:1.7 0.00039749999999999996 0.24 AML other m 2020-09-04T11:16:49.71
IV.LNSS.HHN. ML:1.7 0.00038549999999999994 1.58 AML other m 2020-09-04T11:16:50.93
IV.RM33.EHE. ML:1.6 0.00022299999999999997 0.14 AML other m 2020-09-04T11:16:51.50
IV.RM33.EHN. ML:1.6 0.000262 0.54 AML other m 2020-09-04T11:16:51.34
IV.GAVE.EHE. ML:1.8 0.0003625 0.6 AML other m 2020-09-04T11:16:51.79
IV.GAVE.EHN. ML:1.9 0.00042200000000000007 0.38 AML other m 2020-09-04T11:16:51.61
IV.TERO.HHN. ML:1.7 0.000216 0.1 AML other m 2020-09-04T11:16:53.51
IV.TERO.HHE. ML:1.5 0.00014050000000000003 0.12 AML other m 2020-09-04T11:16:53.66
IV.MF5.EHN. ML:1.4 0.00010925 0.6 AML other m 2020-09-04T11:16:55.65
IV.CESI.HHN. ML:1.3 0.00007425000000000002 0.28 AML other m 2020-09-04T11:16:55.70
IV.MF5.EHE. ML:1.5 0.00012445000000000002 0.6 AML other m 2020-09-04T11:16:56.35
IV.FDMO.HHN. ML:1.2 0.00006225 0.48 AML other m 2020-09-04T11:16:56.12
IV.CESI.HHE. ML:1.3 0.00006914999999999999 0.9 AML other m 2020-09-04T11:16:56.37
IV.GUMA.HHN. ML:2.0 0.000322 0.58 AML other m 2020-09-04T11:16:56.48
IV.FDMO.HHE. ML:1.2 0.0000608 0.12 AML other m 2020-09-04T11:16:56.86
IV.ARRO.EHE. ML:1.1 0.00004720000000000001 0.72 AML other m 2020-09-04T11:16:57.01
IV.ARRO.EHN. ML:1.2 0.00004855 1.12 AML other m 2020-09-04T11:16:57.88
IV.GUMA.HHE. ML:1.9 0.0002655 0.7 AML other m 2020-09-04T11:16:58.32
IV.OFFI.HHE. ML:1.8 0.000171 0.54 AML other m 2020-09-04T11:16:59.40
IV.OFFI.HHN. ML:1.9 0.000215 0.62 AML other m 2020-09-04T11:17:00.49
IV.MNTT.EHN. ML:2.0 0.000248 0.36 AML other m 2020-09-04T11:17:00.67
IV.ASSB.HHN. ML:1.2 0.000035499999999999996 0.64 AML other m 2020-09-04T11:17:01.65
IV.ASSB.HHE. ML:1.2 0.00003295 0.26 AML other m 2020-09-04T11:17:02.25
IV.MNTT.EHE. ML:2.0 0.00026250000000000004 0.16 AML other m 2020-09-04T11:17:02.22
IV.VIVA.HHN. ML:2.8 0.0004805 0.18 AML other m 2020-09-04T11:17:04.96
IV.VIVA.HHE. ML:2.8 0.000449 0.32 AML other m 2020-09-04T11:17:05.24
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