Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.7 on date 20-10-2021 and time 03:44:06 (Italy) in region 8 km W Montegallo (AP)

A magnitude ML 1.7 earthquake occured in region: 8 km W Montegallo (AP), on

  • 20-10-2021 01:44:06 (UTC)
  • 20-10-2021 03:44:06 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.8510, 13.2400 at 15 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
Montegallo AP 8 523 523
Castelsantangelo sul Nera MC 9 281 804
Montemonaco AP 9 604 1408
Arquata del Tronto AP 10 1178 2586
Montefortino FM 13 1178 3764
Ussita MC 13 444 4208
Norcia PG 14 4957 9165
Visso MC 15 1107 10272
Bolognola MC 16 142 10414
Acquasanta Terme AP 17 2916 13330
Preci PG 17 724 14054
Accumoli RI 17 667 14721
Amandola FM 17 3629 18350
Comunanza AP 19 3166 21516
Palmiano AP 19 196 21712
Roccafluvione AP 19 2010 23722

Municipalities with at least 50000 inhabitants

An earthquake occurred to
44 Km W of Teramo (54892 inhabitants)
45 Km E of Foligno (57155 inhabitants)
57 Km N of L'Aquila (69753 inhabitants)
58 Km NE of Terni (111501 inhabitants)
75 Km E of Perugia (166134 inhabitants)
83 Km W of Montesilvano (53738 inhabitants)
88 Km S of Ancona (100861 inhabitants)
91 Km W of Pescara (121014 inhabitants)
94 Km NW 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 1.7 2021-10-20
01:44:06		 42.8512 13.2397 15 2022-03-30
13:04:26		 Bollettino Sismico Italiano INGV 99285151
Reviewed
Rev100 		ML 1.7 2021-10-20
01:44:06		 42.8462 13.2322 15 2021-10-20
01:50:31		 Sala Sismica INGV-Roma 96779701
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-10-20 01:44:06 ± 0.08
Latitude 42.8512 ± 0.0027
Longitude 13.2397 ± 0.0049
Depth (km) 15 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 99285151

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 426
Semi-minor axis of confidence ellipse (meter) 135
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 81
Circular confidence region, given by single value of horizontal uncertainty (meter) 430.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 54
Number of associated phases, regardless of their use for origin computation 64
Number of defining phases 53
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.32
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.73654
Number of stations at which the event was observed 38
Number of stations from which data was used for origin computation 29
Magnitudes information

ML:1.7

Field Value
Value 1.7
Uncertainty 0.3
Num. used stations 56
Type of magnitude ML
Reference to an origin 99285151
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2022-01-03 15:20:45

ML:1.7

Field Value
Value 1.7
Uncertainty 0.3
Num. used stations 56
Type of magnitude ML
Reference to an origin 96779701
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-10-20 01:50:31
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.MURB.HHZ. 2021-10-20T01:44:31.39 3.0 undecidable manual S 0.73 0
IV.ARVD.HHZ. 2021-10-20T01:44:30.63 0.3 undecidable manual S 342 75.6687 93 1.14 45
IV.FAGN.HHZ. 2021-10-20T01:44:29.02 3.0 undecidable manual S -0.38 0
IV.VCEL.EHZ. 2021-10-20T01:44:29.97 3.0 undecidable manual S 0.66 0
IV.CESX.HHZ. 2021-10-20T01:44:26.13 3.0 undecidable manual S -0.31 0
IV.CING.HHZ. 2021-10-20T01:44:25.23 0.3 undecidable manual S 356 58.2972 95 0.38 64
IV.EL6.EHZ. 2021-10-20T01:44:24.52 0.3 undecidable manual S 348 54.2013 95 0.75 57
IV.MOMA.HHZ. 2021-10-20T01:44:24.81 3.0 undecidable manual S -0.28 0
IV.GIGS.HHN. 2021-10-20T01:44:23.01 0.3 undecidable manual S 148 51.8037 95 -0.13 68
IV.OFFI.HHZ. 2021-10-20T01:44:21.28 0.3 undecidable manual S 75 37.4292 98 1.96 29
IV.T0110.HHZ. 2021-10-20T01:44:20.62 0.6 undecidable manual P 147 81.7515 93 -0.21 42
IV.TERO.HHZ. 2021-10-20T01:44:19.63 0.3 undecidable manual S 130 39.0276 98 -0.11 70
IV.ARVD.HHZ. 2021-10-20T01:44:19.55 0.3 undecidable manual P 342 75.6687 93 -0.35 62
IV.RM33.EHZ. 2021-10-20T01:44:19.84 0.3 undecidable manual S 183 38.0286 98 0.37 66
IV.SSFR.HHZ. 2021-10-20T01:44:19.82 3.0 positive manual P -0.29 0
IV.FAGN.HHZ. 2021-10-20T01:44:19.08 3.0 undecidable manual P -0.2 0
IV.CAMP.HHE. 2021-10-20T01:44:19.49 0.3 undecidable manual S 158 37.629 98 0.12 70
IV.MML1.EHZ. 2021-10-20T01:44:19.03 0.3 undecidable manual S 323 36.3414 99 0 72
IV.VCEL.EHZ. 2021-10-20T01:44:19.08 3.0 negative manual P -0.15 0
IV.CESI.HHZ. 2021-10-20T01:44:18.12 0.3 undecidable manual S 302 32.1456 101 0.2 69
IV.LNSS.HHZ. 2021-10-20T01:44:18.43 0.3 undecidable manual S 211 31.9458 101 0.55 64
IV.GAVE.EHZ. 2021-10-20T01:44:18.95 0.3 undecidable manual S 238 33.2445 100 0.75 59
IV.FOSV.EHZ. 2021-10-20T01:44:17.81 3.0 negative manual P -0.32 0
IV.ASSB.HHZ. 2021-10-20T01:44:17.57 3.0 positive manual P 1.19 0
IV.SAP2.EHZ. 2021-10-20T01:44:17.84 0.3 undecidable manual S 25 30.1476 102 0.43 66
IV.CSP1.EHZ. 2021-10-20T01:44:16.25 0.1 undecidable manual S 354 26.8509 104 -0.3 92
IV.CING.HHZ. 2021-10-20T01:44:16.83 0.3 undecidable manual P 356 58.2972 95 -0.39 64
IV.GUMA.HHZ. 2021-10-20T01:44:16.17 0.1 undecidable manual S 18 24.753 106 0.17 94
IV.SMA1.EHZ. 2021-10-20T01:44:16.29 0.3 undecidable manual S 162 25.6521 105 0.04 73
IV.EL6.EHZ. 2021-10-20T01:44:16.30 0.3 undecidable manual P 348 54.2013 95 -0.3 66
IV.T1299.HNN. 2021-10-20T01:44:16.27 0.1 undecidable manual S 172 24.3534 107 0.38 91
IV.GIGS.HHN. 2021-10-20T01:44:15.72 0.3 undecidable manual P 148 51.8037 95 -0.51 62
IV.ARRO.EHZ. 2021-10-20T01:44:15.98 3.0 negative manual P 0.1 0
IV.FDMO.HHZ. 2021-10-20T01:44:15.41 0.3 undecidable manual S 329 23.9538 107 -0.4 68
IT.MTCL.HGZ. 2021-10-20T01:44:15.83 0.3 undecidable manual S 309 25.1526 106 -0.27 69
IV.MF5.EHZ. 2021-10-20T01:44:15.97 0.3 undecidable manual S 50 23.4543 108 0.3 69
IV.SNTG.HHZ. 2021-10-20T01:44:15.80 0.3 undecidable manual P 332 50.9157 96 -0.29 66
IV.MNTT.EHZ. 2021-10-20T01:44:14.33 0.1 undecidable manual P 51 37.2294 99 0.34 89
IV.MNTP.HNZ. 2021-10-20T01:44:14.18 0.3 undecidable manual P 30 36.8298 99 0.25 68
IV.OFFI.HHZ. 2021-10-20T01:44:14.57 0.3 undecidable manual P 75 37.4292 98 0.54 64
IV.GAVE.EHZ. 2021-10-20T01:44:13.42 0.3 undecidable manual P 238 33.2445 100 0.04 72
IV.CAMP.HHE. 2021-10-20T01:44:13.77 0.1 positive manual P 158 37.629 98 -0.28 90
IV.MML1.EHZ. 2021-10-20T01:44:13.58 0.1 positive manual P 323 36.3414 99 -0.28 91
IV.MTRA.EHZ. 2021-10-20T01:44:13.67 0.3 undecidable manual S 129 16.4724 119 -0.3 70
IV.CESI.HHZ. 2021-10-20T01:44:13.09 0.1 positive manual P 302 32.1456 101 -0.13 94
IV.TERO.HHZ. 2021-10-20T01:44:13.87 0.1 undecidable manual P 130 39.0276 98 -0.4 88
IV.LNSS.HHZ. 2021-10-20T01:44:13.20 0.1 positive manual P 211 31.9458 101 0 96
IV.RM33.EHZ. 2021-10-20T01:44:13.99 0.1 positive manual P 183 38.0286 98 -0.12 93
IV.SMA1.EHZ. 2021-10-20T01:44:12.11 0.1 positive manual P 162 25.6521 105 -0.14 95
IV.MC2.EHZ. 2021-10-20T01:44:12.41 0.3 undecidable manual S 328 7.881 146 0.16 73
IV.SAP2.EHZ. 2021-10-20T01:44:12.83 0.1 undecidable manual P 25 30.1476 102 -0.09 95
IV.T1299.HNN. 2021-10-20T01:44:12.10 0.1 positive manual P 172 24.3534 107 0.05 97
IV.NRCA.HHZ. 2021-10-20T01:44:12.65 0.1 undecidable manual S 259 10.3785 136 -0.02 100
IV.CSP1.EHZ. 2021-10-20T01:44:12.11 0.1 positive manual P 354 26.8509 104 -0.32 91
IV.GUMA.HHZ. 2021-10-20T01:44:12.06 0.1 positive manual P 18 24.753 106 -0.05 97
IV.FDMO.HHZ. 2021-10-20T01:44:11.70 0.1 positive manual P 329 23.9538 107 -0.3 92
IT.MTCL.HGZ. 2021-10-20T01:44:11.95 0.1 undecidable manual P 309 25.1526 106 -0.22 94
IV.MF5.EHZ. 2021-10-20T01:44:11.98 0.1 undecidable manual P 50 23.4543 108 0.06 97
IV.FEMA.HNE. 2021-10-20T01:44:11.56 0.6 undecidable manual P 309 19.7691 113 0.17 48
IV.MMO1.EHZ. 2021-10-20T01:44:11.98 0.3 undecidable manual S 53 8.88 142 -0.43 69
IV.MTRA.EHZ. 2021-10-20T01:44:10.76 0.1 undecidable manual P 129 16.4724 119 -0.18 95
IV.NRCA.HHZ. 2021-10-20T01:44:10.23 0.1 negative manual P 259 10.3785 136 0.04 99
IV.MMO1.EHZ. 2021-10-20T01:44:09.80 0.1 undecidable manual P 53 8.88 142 -0.24 96
IV.MC2.EHZ. 2021-10-20T01:44:09.98 0.1 undecidable manual P 328 7.881 146 0.04 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.MTRA.EHN. ML:1.9 0.000583 0.18 AML other m 2021-10-20T01:44:13.70
IV.MTRA.HNN. ML:1.9 0.00062 0.18 AML other m 2021-10-20T01:44:13.70
IV.MTRA.EHE. ML:1.9 0.0006680000000000001 0.22 AML other m 2021-10-20T01:44:14.12
IV.MTRA.HNE. ML:1.9 0.0006675 0.22 AML other m 2021-10-20T01:44:14.23
IV.FDMO.HHN. ML:1.9 0.00048249999999999996 0.24 AML other m 2021-10-20T01:44:15.78
IV.FDMO.HHE. ML:1.6 0.0002525 0.24 AML other m 2021-10-20T01:44:15.69
IV.MF5.EHN. ML:1.9 0.00046750000000000003 0.36 AML other m 2021-10-20T01:44:16.43
IV.CSP1.EHN. ML:1.8 0.0003495 0.28 AML other m 2021-10-20T01:44:16.50
IV.MF5.EHE. ML:1.6 0.00021349999999999999 0.88 AML other m 2021-10-20T01:44:16.08
IV.GUMA.HHE. ML:2.1 0.000657 0.66 AML other m 2021-10-20T01:44:16.48
IV.SMA1.EHE. ML:1.5 0.000158 0.22 AML other m 2021-10-20T01:44:16.79
IV.GUMA.HNN. ML:2.0 0.0005645 0.76 AML other m 2021-10-20T01:44:17.43
IV.SMA1.EHN. ML:1.6 0.00021050000000000002 0.5 AML other m 2021-10-20T01:44:17.69
IV.CSP1.EHE. ML:1.8 0.000314 0.42 AML other m 2021-10-20T01:44:17.78
IV.CESI.HHN. ML:1.6 0.0001505 0.24 AML other m 2021-10-20T01:44:18.41
IV.CESI.HHE. ML:1.6 0.00015 0.78 AML other m 2021-10-20T01:44:18.42
IV.SAP2.EHN. ML:2.4 0.0010400000000000001 1.06 AML other m 2021-10-20T01:44:18.03
IV.LNSS.HHE. ML:1.5 0.00014350000000000002 0.14 AML other m 2021-10-20T01:44:19.07
IV.GUMA.HHN. ML:2.0 0.000503 1.46 AML other m 2021-10-20T01:44:19.20
IV.SAP2.EHE. ML:1.8 0.0002575 0.92 AML other m 2021-10-20T01:44:19.67
IV.GAVE.EHN. ML:1.8 0.000241 0.26 AML other m 2021-10-20T01:44:19.27
IV.MML1.EHE. ML:1.4 0.00009214999999999999 0.3 AML other m 2021-10-20T01:44:19.31
IV.LNSS.HHN. ML:1.6 0.00016 0.18 AML other m 2021-10-20T01:44:19.36
IV.MML1.EHN. ML:1.6 0.00014000000000000001 0.34 AML other m 2021-10-20T01:44:19.36
IV.GAVE.EHE. ML:1.6 0.00017649999999999998 0.8 AML other m 2021-10-20T01:44:20.08
IV.RM33.EHN. ML:1.8 0.000214 0.24 AML other m 2021-10-20T01:44:20.07
IV.TERO.HHE. ML:1.8 0.00019250000000000002 0.1 AML other m 2021-10-20T01:44:20.31
IV.RM33.EHE. ML:1.6 0.0001555 0.16 AML other m 2021-10-20T01:44:20.45
IV.GUMA.HNE. ML:1.9 0.00045799999999999997 0.94 AML other m 2021-10-20T01:44:20.53
IV.TERO.HHN. ML:1.6 0.000152 0.08 AML other m 2021-10-20T01:44:20.64
IV.MNTT.EHE. ML:2.3 0.0007809999999999999 0.1 AML other m 2021-10-20T01:44:22.32
IV.OFFI.HHN. ML:1.5 0.0001215 0.46 AML other m 2021-10-20T01:44:22.49
IV.MNTT.EHN. ML:2.0 0.0004005 0.7 AML other m 2021-10-20T01:44:22.45
IV.OFFI.HHE. ML:1.5 0.00010284999999999999 0.34 AML other m 2021-10-20T01:44:23.07
IV.ASSB.HHE. ML:1.4 0.00006185 1.14 AML other m 2021-10-20T01:44:24.67
IV.ASSB.HHN. ML:1.6 0.0000949 0.26 AML other m 2021-10-20T01:44:24.16
IV.SNTG.HHE. ML:1.0 0.000027300000000000003 0.8 AML other m 2021-10-20T01:44:24.47
IV.MOMA.HHN. ML:1.2 0.00003595 0.34 AML other m 2021-10-20T01:44:26.00
IV.SNTG.HHN. ML:1.1 0.0000309 0.54 AML other m 2021-10-20T01:44:26.56
IV.FOSV.EHE. ML:1.2 0.00002835 1.16 AML other m 2021-10-20T01:44:26.79
IV.FOSV.EHN. ML:1.5 0.00005745 1.6 AML other m 2021-10-20T01:44:26.87
IV.CING.HHE. ML:1.4 0.000052699999999999993 0.14 AML other m 2021-10-20T01:44:27.06
IV.CING.HHN. ML:1.3 0.0000427 0.68 AML other m 2021-10-20T01:44:27.42
IV.MOMA.HHE. ML:1.2 0.00004105 0.16 AML other m 2021-10-20T01:44:27.55
IV.SSFR.HHN. ML:1.7 0.00007714999999999999 0.7 AML other m 2021-10-20T01:44:30.55
IV.SSFR.HHE. ML:1.8 0.0001055 0.22 AML other m 2021-10-20T01:44:30.70
IV.VCEL.EHE. ML:1.4 0.000046949999999999996 0.92 AML other m 2021-10-20T01:44:30.39
IV.VCEL.EHN. ML:1.5 0.00005275000000000001 0.42 AML other m 2021-10-20T01:44:31.51
IV.MURB.HHN. ML:1.8 0.00008755 0.3 AML other m 2021-10-20T01:44:31.53
IV.MURB.HHE. ML:1.9 0.0001315 0.24 AML other m 2021-10-20T01:44:31.74
IV.FAGN.HHE. ML:1.7 0.0000837 0.28 AML other m 2021-10-20T01:44:31.70
IV.ARVD.HHN. ML:1.0 0.000015277 0.72 AML other m 2021-10-20T01:44:32.36
IV.ARVD.HHE. ML:1.0 0.000017049999999999998 0.8 AML other m 2021-10-20T01:44:32.67
IV.FAGN.HHN. ML:1.6 0.00006994999999999999 0.62 AML other m 2021-10-20T01:44:32.87
IV.T0110.HHE. ML:1.5 0.00004185 0.46 AML other m 2021-10-20T01:44:35.60
IV.T0110.HHN. ML:1.6 0.000050199999999999994 0.32 AML other m 2021-10-20T01:44:35.52
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