Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.5 on date 20-10-2021 and time 05:38:00 (UTC) in region 7 km W Montegallo (AP)

A magnitude ML 1.5 earthquake occured in region: 7 km W Montegallo (AP), on

  • 20-10-2021 05:38:00 (UTC)
  • 20-10-2021 07:38:00 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.8590, 13.2490 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 7 523 523
Montemonaco AP 8 604 1127
Castelsantangelo sul Nera MC 9 281 1408
Arquata del Tronto AP 10 1178 2586
Montefortino FM 12 1178 3764
Ussita MC 13 444 4208
Norcia PG 15 4957 9165
Bolognola MC 15 142 9307
Visso MC 15 1107 10414
Amandola FM 16 3629 14043
Acquasanta Terme AP 17 2916 16959
Preci PG 17 724 17683
Comunanza AP 18 3166 20849
Palmiano AP 18 196 21045
Accumoli RI 18 667 21712
Roccafluvione AP 19 2010 23722
Acquacanina MC 20 121 23843

Municipalities with at least 50000 inhabitants

An earthquake occurred to
43 Km NW of Teramo (54892 inhabitants)
46 Km E of Foligno (57155 inhabitants)
58 Km N of L'Aquila (69753 inhabitants)
59 Km NE of Terni (111501 inhabitants)
75 Km E of Perugia (166134 inhabitants)
83 Km W of Montesilvano (53738 inhabitants)
87 Km S of Ancona (100861 inhabitants)
90 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 1.5 2021-10-20
05:38:00		 42.8592 13.2488 15 2022-03-30
13:04:26		 Bollettino Sismico Italiano INGV 99286931
Reviewed
Rev100 		ML 1.5 2021-10-20
05:38:00		 42.861 13.2455 13 2021-10-20
06:05:02		 Sala Sismica INGV-Roma 96788491
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-10-20 05:38:00 ± 0.05
Latitude 42.8592 ± 0.0027
Longitude 13.2488 ± 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 99286931

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 365
Semi-minor axis of confidence ellipse (meter) 101
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 245
Circular confidence region, given by single value of horizontal uncertainty (meter) 370.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 77
Number of associated phases, regardless of their use for origin computation 39
Number of defining phases 35
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.18
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.48204
Number of stations at which the event was observed 23
Number of stations from which data was used for origin computation 19
Magnitudes information

ML:1.5

Field Value
Value 1.5
Uncertainty 0.2
Num. used stations 42
Type of magnitude ML
Reference to an origin 96788491
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-10-20 06:05:02

ML:1.5

Field Value
Value 1.5
Uncertainty 0.2
Num. used stations 42
Type of magnitude ML
Reference to an origin 99286931
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2022-01-03 16:24:30
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.TST02.HHZ. 2021-10-20T05:38:41.24 3.0 undecidable manual S 2.56 0
IV.SRES.HHZ. 2021-10-20T05:38:26.37 3.0 undecidable manual S -2.68 0
IV.VCEL.EHZ. 2021-10-20T05:38:20.75 3.0 undecidable manual S -2.27 0
IV.RM33.EHZ. 2021-10-20T05:38:13.38 0.3 undecidable manual S 184 38.9277 98 0.25 68
IV.TERO.HHZ. 2021-10-20T05:38:13.14 0.3 undecidable manual S 132 39.0276 98 -0.01 71
IV.GAVE.EHZ. 2021-10-20T05:38:12.18 0.6 undecidable manual S 237 34.3434 100 0.28 46
IV.MML1.EHZ. 2021-10-20T05:38:12.51 0.3 undecidable manual S 322 36.0417 99 0.14 70
IV.CAMP.HHE. 2021-10-20T05:38:12.98 0.3 undecidable manual S 160 38.1285 98 0.06 70
IV.CESI.HHZ. 2021-10-20T05:38:11.60 0.3 undecidable manual S 300 32.3454 100 0.22 69
IV.CING.HHZ. 2021-10-20T05:38:10.45 3.0 negative manual P -0.16 0
IV.CSP1.EHZ. 2021-10-20T05:38:09.67 0.6 undecidable manual S 352 26.0517 105 -0.08 48
IV.EL6.EHZ. 2021-10-20T05:38:09.84 0.6 undecidable manual P 347 53.502 95 -0.06 46
IV.SMA1.EHZ. 2021-10-20T05:38:09.61 0.3 undecidable manual S 164 26.3514 104 -0.21 70
IV.T1299.HNZ. 2021-10-20T05:38:09.86 0.6 undecidable manual S 174 25.0527 106 0.36 45
IT.MTCL.HGZ. 2021-10-20T05:38:09.34 0.3 undecidable manual S 306 25.1526 105 -0.18 70
IV.MF5.EHZ. 2021-10-20T05:38:09.48 0.6 undecidable manual S 50 22.2555 109 0.69 40
IV.FDMO.HHZ. 2021-10-20T05:38:08.88 0.6 undecidable manual S 326 23.6541 107 -0.25 46
IV.MML1.EHZ. 2021-10-20T05:38:07.10 0.1 undecidable manual P 322 36.0417 99 -0.13 93
IV.CAMP.HHE. 2021-10-20T05:38:07.28 0.1 undecidable manual P 160 38.1285 98 -0.27 90
IV.MTRA.EHZ. 2021-10-20T05:38:07.18 0.6 undecidable manual S 133 16.5723 119 -0.2 48
IV.GAVE.EHZ. 2021-10-20T05:38:07.19 0.3 undecidable manual P 237 34.3434 100 0.23 69
IV.RM33.EHZ. 2021-10-20T05:38:07.51 0.1 undecidable manual P 184 38.9277 98 -0.16 92
IV.TERO.HHZ. 2021-10-20T05:38:07.58 0.3 undecidable manual P 132 39.0276 98 -0.1 70
IV.NRCA.HHZ. 2021-10-20T05:38:06.20 0.6 undecidable manual S 255 11.2776 133 -0.05 49
IV.CESI.HHZ. 2021-10-20T05:38:06.62 0.3 positive manual P 300 32.3454 100 -0.04 71
IV.LNSS.HHZ. 2021-10-20T05:38:06.72 0.1 positive manual P 211 33.1446 100 -0.06 94
IV.PF6.EHN. 2021-10-20T05:38:06.31 0.1 undecidable manual P 352 31.2465 101 -0.18 93
IV.FDMO.HHZ. 2021-10-20T05:38:05.22 0.1 positive manual P 326 23.6541 107 -0.14 95
IV.T1299.HNZ. 2021-10-20T05:38:05.69 0.1 undecidable manual P 174 25.0527 106 0.12 95
IT.MTCL.HGZ. 2021-10-20T05:38:05.47 0.3 undecidable manual P 306 25.1526 105 -0.12 71
IV.MF5.EHZ. 2021-10-20T05:38:05.54 0.1 undecidable manual P 50 22.2555 109 0.38 90
IV.CSP1.EHZ. 2021-10-20T05:38:05.62 0.1 positive manual P 352 26.0517 105 -0.1 95
IV.MMO1.EHZ. 2021-10-20T05:38:05.48 0.1 undecidable manual S 55 7.7811 146 -0.15 98
IV.SMA1.EHZ. 2021-10-20T05:38:05.63 0.1 positive manual P 164 26.3514 104 -0.13 95
IV.MC2.EHZ. 2021-10-20T05:38:05.89 0.3 undecidable manual S 320 7.5813 147 0.29 71
IV.MTRA.EHZ. 2021-10-20T05:38:04.29 0.1 negative manual P 133 16.5723 119 -0.06 98
IV.MMO1.EHZ. 2021-10-20T05:38:03.32 0.1 negative manual P 55 7.7811 146 -0.02 100
IV.MC2.EHZ. 2021-10-20T05:38:03.54 0.1 negative manual P 320 7.5813 147 0.22 96
IV.NRCA.HHZ. 2021-10-20T05:38:03.76 0.1 negative manual P 255 11.2776 133 0.06 99
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.NRCA.HNE. ML:1.9 0.000844 0.14 AML other m 2021-10-20T05:38:06.34
IV.NRCA.HHE. ML:1.9 0.00071069635 0.0608 AML other m 2021-10-20T05:38:06.35
IV.NRCA.HHN. ML:2.0 0.0009044999999999999 0.08 AML other m 2021-10-20T05:38:06.78
IV.NRCA.HNN. ML:1.9 0.0008269999999999999 0.08 AML other m 2021-10-20T05:38:06.82
IV.MTRA.EHN. ML:1.5 0.00024495319999999997 0.08 AML other m 2021-10-20T05:38:07.31
IV.MTRA.HNN. ML:1.5 0.0002457007 0.08 AML other m 2021-10-20T05:38:07.31
IV.LNSS.HNN. ML:1.6 0.0001431308 0.8 AML other m 2021-10-20T05:38:07.44
IV.MTRA.EHE. ML:1.7 0.0003738859 0.1408 AML other m 2021-10-20T05:38:07.64
IV.MTRA.HNE. ML:1.7 0.00035846045 0.1376 AML other m 2021-10-20T05:38:07.64
IV.FDMO.HHN. ML:1.7 0.000264 0.24 AML other m 2021-10-20T05:38:09.30
IV.FDMO.HHE. ML:1.4 0.00014150000000000002 0.24 AML other m 2021-10-20T05:38:09.21
IV.CSP1.EHN. ML:1.5 0.00015105025 0.24 AML other m 2021-10-20T05:38:09.85
IV.MF5.EHN. ML:1.4 0.00013478318 0.1984 AML other m 2021-10-20T05:38:09.76
IV.MF5.EHE. ML:1.2 0.000105888165 1.8176 AML other m 2021-10-20T05:38:10.04
IV.SMA1.EHN. ML:1.4 0.00011835415 0.0992 AML other m 2021-10-20T05:38:10.24
IV.SMA1.EHE. ML:1.4 0.00013000000000000002 0.08 AML other m 2021-10-20T05:38:10.35
IV.CSP1.EHE. ML:1.5 0.00016450000000000001 0.4 AML other m 2021-10-20T05:38:11.30
IV.CESI.HHN. ML:1.4 0.00009283865499999999 0.24 AML other m 2021-10-20T05:38:11.92
IV.LNSS.HHN. ML:1.4 0.00010544789500000001 0.1408 AML other m 2021-10-20T05:38:12.41
IV.CESI.HHE. ML:1.3 0.000081741945 0.16 AML other m 2021-10-20T05:38:12.55
IV.LNSS.HHE. ML:1.4 0.000096133045 0.1216 AML other m 2021-10-20T05:38:12.59
IV.MML1.EHN. ML:1.2 0.00005587028 0.1408 AML other m 2021-10-20T05:38:12.70
IV.GAVE.EHN. ML:1.6 0.00014945625000000002 0.2784 AML other m 2021-10-20T05:38:12.80
IV.GAVE.EHE. ML:1.4 0.0001034558 0.1216 AML other m 2021-10-20T05:38:13.06
IV.MML1.EHE. ML:1.0 0.000040431425 0.0992 AML other m 2021-10-20T05:38:13.13
IV.CESI.HNN. ML:1.5 0.00013488425000000002 0.48 AML other m 2021-10-20T05:38:13.57
IV.RM33.HNN. ML:1.7 0.0001589595 0.2496 AML other m 2021-10-20T05:38:13.71
IV.RM33.EHN. ML:1.6 0.000143 0.24 AML other m 2021-10-20T05:38:13.71
IV.TERO.HHE. ML:1.6 0.0001265 0.1 AML other m 2021-10-20T05:38:13.83
IV.TERO.HNE. ML:1.5 0.00011629389500000001 0.0896 AML other m 2021-10-20T05:38:13.84
IV.RM33.EHE. ML:1.4 0.00009595 0.12 AML other m 2021-10-20T05:38:13.96
IV.TERO.HHN. ML:1.5 0.0001061 0.08 AML other m 2021-10-20T05:38:14.16
IV.GAVE.HNN. ML:1.7 0.00018346325000000003 0.8096 AML other m 2021-10-20T05:38:17.57
IV.MML1.HNN. ML:1.6 0.000128779645 0.56 AML other m 2021-10-20T05:38:18.37
IV.LNSS.HNE. ML:1.5 0.000139433265 0.992 AML other m 2021-10-20T05:38:18.06
IV.EL6.EHE. ML:1.1 0.000032426105 0.24 AML other m 2021-10-20T05:38:18.69
IV.CESI.HNE. ML:1.5 0.00013096195 0.6496 AML other m 2021-10-20T05:38:19.25
IV.EL6.EHN. ML:1.1 0.000029477155000000003 0.2208 AML other m 2021-10-20T05:38:19.82
IV.GAVE.HNE. ML:1.5 0.0001296121 1.2096 AML other m 2021-10-20T05:38:20.64
IV.RM33.HNE. ML:1.7 0.00017258779999999998 1.1904 AML other m 2021-10-20T05:38:22.65
IV.MML1.HNE. ML:1.4 0.00010714141999999998 1.152 AML other m 2021-10-20T05:38:25.40
IV.TERO.HNN. ML:1.6 0.00014026417 1.3504 AML other m 2021-10-20T05:38:26.22
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