Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.0 on date 13-10-2020 and time 23:35:52 (Italy) in region 4 km NW Accumoli (RI)

A magnitude ML 1.0 earthquake occured in region: 4 km NW Accumoli (RI), on

  • 13-10-2020 21:35:52 (UTC)
  • 13-10-2020 23:35:52 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.7240, 13.2240 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
Accumoli RI 4 667 667
Arquata del Tronto AP 8 1178 1845
Amatrice RI 12 2657 4502
Cittareale RI 13 482 4984
Norcia PG 13 4957 9941
Montegallo AP 16 523 10464
Acquasanta Terme AP 16 2916 13380
Cascia PG 17 3217 16597
Castelsantangelo sul Nera MC 20 281 16878

Municipalities with at least 50000 inhabitants

An earthquake occurred to
40 Km W of Teramo (54892 inhabitants)
44 Km NW of L'Aquila (69753 inhabitants)
50 Km SE of Foligno (57155 inhabitants)
51 Km E of Terni (111501 inhabitants)
79 Km W of Montesilvano (53738 inhabitants)
80 Km SE of Perugia (166134 inhabitants)
86 Km W of Pescara (121014 inhabitants)
88 Km W of Chieti (51815 inhabitants)
90 Km NE of Guidonia Montecelio (88673 inhabitants)
91 Km NE of Tivoli (56533 inhabitants)
98 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 1.0 2020-10-13
21:35:52		 42.7237 13.224 11 2021-02-26
14:56:02		 Bollettino Sismico Italiano INGV 84260461
Reviewed
Rev100 		ML 1.1 2020-10-13
21:35:52		 42.7237 13.2168 10 2020-10-13
21:58:58		 Sala Sismica INGV-Roma 83763731
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-10-13 21:35:52 ± 0.03
Latitude 42.7237 ± 0.0018
Longitude 13.2240 ± 0.0037
Depth (km) 11 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 84260461

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 249
Semi-minor axis of confidence ellipse (meter) 105
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 256
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) 46
Number of associated phases, regardless of their use for origin computation 37
Number of defining phases 37
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.17
Epicentral distance of station closest to the epicenter (degree) 0.09893
Epicentral distance of station farthest from the epicenter (degree) 0.52251
Number of stations at which the event was observed 23
Number of stations from which data was used for origin computation 23
Magnitudes information

ML:1.0

Field Value
Value 1.0
Uncertainty 0.2
Num. used stations 6
Type of magnitude ML
Reference to an origin 84260461
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2020-10-30 11:43:43

ML:1.1

Field Value
Value 1.1
Uncertainty 0.3
Num. used stations 10
Type of magnitude ML
Reference to an origin 83763731
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-10-13 21:58:58
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.CESI.HHZ. 2020-10-13T21:36:06.15 0.3 undecidable manual S 320 40.626 90 0.17 70
IV.CSP1.EHZ. 2020-10-13T21:36:06.10 0.3 undecidable manual S 358 40.8258 90 0.05 72
IV.FDMO.HHZ. 2020-10-13T21:36:04.88 0.3 undecidable manual S 342 36.4413 90 0.02 73
IT.MTCL.HGZ. 2020-10-13T21:36:04.41 0.6 undecidable manual S 329 35.1426 90 -0.1 48
IV.ASSB.HHZ. 2020-10-13T21:36:02.97 0.3 undecidable manual P 308 57.9975 90 -0.07 69
IV.GAVE.EHZ. 2020-10-13T21:36:02.36 0.3 undecidable manual S 263 27.1506 91 -0.01 74
IV.MOMA.HNZ. 2020-10-13T21:36:02.36 0.6 undecidable manual P 280 54.0015 90 -0.06 46
IV.CESX.HHE. 2020-10-13T21:36:02.47 0.6 undecidable manual P 256 53.502 90 0.12 46
IV.CAMP.HHZ. 2020-10-13T21:36:01.68 0.3 undecidable manual S 144 25.752 91 -0.32 70
IV.MNTT.EHZ. 2020-10-13T21:36:01.86 0.3 undecidable manual P 39 48.2184 90 0.34 67
IV.OFFI.HHZ. 2020-10-13T21:36:01.31 0.6 undecidable manual P 58 44.3223 90 0.39 44
IV.RM33.EHZ. 2020-10-13T21:36:01.43 0.3 undecidable manual S 182 23.8539 91 -0.07 74
IV.MC2.EHZ. 2020-10-13T21:36:00.85 0.3 undecidable manual S 352 21.0678 91 0.1 74
IV.CESI.HHZ. 2020-10-13T21:36:00.14 0.3 undecidable manual P 320 40.626 90 -0.21 69
IV.LNSS.HHZ. 2020-10-13T21:36:00.56 0.6 undecidable manual S 228 20.0688 91 0.06 50
IV.CSP1.EHZ. 2020-10-13T21:36:00.31 0.3 undecidable manual P 358 40.8258 90 -0.09 71
IV.MMO1.EHZ. 2020-10-13T21:36:00.56 0.3 undecidable manual S 23 21.1677 91 -0.24 71
IV.ARRO.EHZ. 2020-10-13T21:36:00.11 0.1 undecidable manual P 247 40.7259 90 -0.26 91
IV.GUMA.HNN. 2020-10-13T21:36:00.33 0.1 undecidable manual P 13 38.7279 90 0.27 92
IT.MTCL.HGZ. 2020-10-13T21:35:59.31 0.1 undecidable manual P 329 35.1426 90 -0.2 93
IV.FDMO.HHZ. 2020-10-13T21:35:59.63 0.1 undecidable manual P 342 36.4413 90 -0.08 95
IV.MF5.EHZ. 2020-10-13T21:35:59.80 0.3 undecidable manual P 33 35.0427 90 0.3 69
IV.SMA1.EHZ. 2020-10-13T21:35:58.79 0.3 undecidable manual S 139 13.7751 100 -0.02 76
IV.NRCA.HHZ. 2020-10-13T21:35:58.95 0.3 undecidable manual S 324 15.0738 95 -0.22 72
IV.T1299.HNZ. 2020-10-13T21:35:58.38 0.1 undecidable manual S 154 10.9779 116 0.27 96
IV.GAVE.EHZ. 2020-10-13T21:35:58.32 0.3 undecidable manual P 263 27.1506 91 0.04 74
IV.MTRA.HNZ. 2020-10-13T21:35:58.70 0.3 undecidable manual S 75 14.5743 96 -0.31 71
IV.TERO.HHZ. 2020-10-13T21:35:58.84 0.3 undecidable manual P 110 32.9448 90 -0.33 69
IV.MMO1.EHZ. 2020-10-13T21:35:57.31 0.1 undecidable manual P 23 21.1677 91 -0.05 99
IV.RM33.EHZ. 2020-10-13T21:35:57.78 0.3 undecidable manual P 182 23.8539 91 0.01 74
IV.MC2.EHZ. 2020-10-13T21:35:57.49 0.3 undecidable manual P 352 21.0678 91 0.15 73
IV.CAMP.HHZ. 2020-10-13T21:35:57.86 0.3 undecidable manual P 144 25.752 91 -0.2 71
IV.LNSS.HHZ. 2020-10-13T21:35:57.29 0.1 undecidable manual P 228 20.0688 91 0.09 98
IV.MTRA.HNZ. 2020-10-13T21:35:56.30 0.6 undecidable manual P 75 14.5743 96 -0.04 50
IV.SMA1.EHZ. 2020-10-13T21:35:56.28 0.1 undecidable manual P 139 13.7751 100 0.06 100
IV.NRCA.HHZ. 2020-10-13T21:35:56.49 0.1 undecidable manual P 324 15.0738 95 0.06 100
IV.T1299.HNZ. 2020-10-13T21:35:56.07 0.1 undecidable manual P 154 10.9779 116 0.25 97
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.SMA1.EHN. ML:0.8 0.00006735 1.42 AML other m 2020-10-13T21:35:59.17
IV.LNSS.HHE. ML:1.2 0.00010495 0.26 AML other m 2020-10-13T21:36:01.02
IV.LNSS.HHN. ML:1.2 0.00011350000000000001 1.8 AML other m 2020-10-13T21:36:01.05
IV.SMA1.EHE. ML:0.8 0.00006709999999999999 1.18 AML other m 2020-10-13T21:36:02.24
IV.FDMO.HHE. ML:0.8 0.000026300000000000002 1.48 AML other m 2020-10-13T21:36:05.19
IV.FDMO.HHN. ML:1.0 0.00003905 0.16 AML other m 2020-10-13T21:36:05.29
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