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) 42.846, 13.232 at 15 km depth.

The earthquake was located by: Sala Sismica INGV-Roma.

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.

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 8 281 804
Arquata del Tronto AP 10 1178 1982
Montemonaco AP 10 604 2586
Norcia PG 13 4957 7543
Ussita MC 13 444 7987
Montefortino FM 14 1178 9165
Visso MC 15 1107 10272
Preci PG 16 724 10996
Bolognola MC 17 142 11138
Acquasanta Terme AP 17 2916 14054
Accumoli RI 17 667 14721
Amandola FM 18 3629 18350
Comunanza AP 19 3166 21516
Palmiano AP 20 196 21712

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)
57 Km NE of Terni (111501 inhabitants)
75 Km E of Perugia (166134 inhabitants)
84 Km W of Montesilvano (53738 inhabitants)
89 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
Preliminary map of the earthquake effects from the web questionnaire

Preliminary map of the earthquake effects from the web questionnaire

This map shows the distribution of the effects of the earthquake on the territory in terms of the MCS (Mercalli-Cancani-Sieberg) intensity scale. The intensities are determined using the data provided in the questionnaire (http://www.haisentitoilterremoto.it/) that are analysed using robust statistical techniques since they are not verified individually. Specifically, the assignment of MCS intensities greater or equal the VI degree of the MCS scale require opportune in situ verification by professional experts. The purple start shows the epicenter. This map is prepared every so often that the population fill in new questionnaires. The number of questionnaires used to determine the map and the date and time of the last adjournment are shown in the upper right part of the panel.
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
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 ± 0.11
Latitude 42.8462 ± 0.0045
Longitude 13.2322 ± 0.0074
Depth (km) 15 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 96779701

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 625
Semi-minor axis of confidence ellipse (meter) 134
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 231
Circular confidence region, given by single value of horizontal uncertainty (meter) 630
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 164
Number of associated phases, regardless of their use for origin computation 44
Number of defining phases 20
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.21
Epicentral distance of station closest to the epicenter (degree) 0
Epicentral distance of station farthest from the epicenter (degree) 0.32825
Number of stations at which the event was observed 31
Number of stations from which data was used for origin computation 10
Magnitude information

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 Takeoff_angle Residual Weight
IV.MURB.HHZ. 2021-10-20T01:44:31.39 3.0 undecidable manual S 0.73 0
IV.ARVD.HHZ. 2021-10-20T01:44:31.04 3.0 undecidable manual S -0.08 0
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.MOMA.HHZ. 2021-10-20T01:44:24.81 3.0 undecidable manual S -0.28 0
IV.EL6.EHZ. 2021-10-20T01:44:24.52 3.0 undecidable manual S -0.3 0
IV.T0110.HHZ. 2021-10-20T01:44:20.92 3.0 undecidable manual P -0.17 0
IV.ARVD.HHZ. 2021-10-20T01:44:19.67 3.0 negative manual P -0.58 0
IV.MML1.EHZ. 2021-10-20T01:44:19.08 0.3 undecidable manual S 325 0.3283 99 0.14 72
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.VCEL.EHZ. 2021-10-20T01:44:19.08 3.0 negative manual P -0.15 0
IV.FOSV.EHZ. 2021-10-20T01:44:17.81 3.0 negative manual P -0.32 0
IV.SAP2.EHZ. 2021-10-20T01:44:17.91 0.3 undecidable manual S 26 0.2788 101 0.42 69
IV.ASSB.HHZ. 2021-10-20T01:44:17.57 3.0 positive manual P 1.19 0
IV.SMA1.EHZ. 2021-10-20T01:44:16.46 0.6 undecidable manual S 161 0.2284 105 0.42 46
IV.CSP1.EHZ. 2021-10-20T01:44:16.33 0.3 undecidable manual S 355 0.2464 104 -0.23 72
IV.GUMA.HHZ. 2021-10-20T01:44:16.37 0.3 undecidable manual S 19 0.2293 105 0.31 71
IV.CING.HHZ. 2021-10-20T01:44:16.82 3.0 positive manual P -0.54 0
IV.FDMO.HHZ. 2021-10-20T01:44:15.54 0.3 undecidable manual S 331 0.2176 107 -0.2 73
IV.ARRO.EHZ. 2021-10-20T01:44:15.98 3.0 negative manual P 0.1 0
IV.MF5.EHZ. 2021-10-20T01:44:15.97 0.3 undecidable manual S 50 0.2185 106 0.21 72
IV.SNTG.HHZ. 2021-10-20T01:44:15.88 3.0 positive manual P -0.33 0
IV.MNTT.EHZ. 2021-10-20T01:44:14.33 3.0 positive manual P 0.44 0
IV.RM33.EHZ. 2021-10-20T01:44:14.02 3.0 positive manual P 0 0
IV.OFFI.HHZ. 2021-10-20T01:44:14.56 3.0 undecidable manual P 0.66 0
IV.TERO.HHZ. 2021-10-20T01:44:13.94 3.0 undecidable manual P -0.18 0
IV.GAVE.EHZ. 2021-10-20T01:44:13.53 3.0 negative manual P 0.15 0
IV.LNSS.HHZ. 2021-10-20T01:44:13.19 3.0 positive manual P 0.05 0
IV.MTRA.EHZ. 2021-10-20T01:44:13.67 0.3 undecidable manual S 127 0.1502 119 -0.21 74
IV.MML1.EHZ. 2021-10-20T01:44:13.58 0.6 positive manual P 325 0.3283 99 -0.18 48
IV.CESI.HHZ. 2021-10-20T01:44:13.11 3.0 positive manual P -0.14 0
IV.GUMA.HHZ. 2021-10-20T01:44:12.06 0.1 positive manual P 19 0.2293 105 -0.04 100
IV.SMA1.EHZ. 2021-10-20T01:44:12.11 0.6 positive manual P 161 0.2284 105 0.03 50
IV.MC2.EHZ. 2021-10-20T01:44:12.41 0.3 undecidable manual S 334 0.0728 145 0.26 73
IV.SAP2.EHZ. 2021-10-20T01:44:12.83 0.1 undecidable manual P 26 0.2788 101 -0.09 98
IV.CSP1.EHZ. 2021-10-20T01:44:12.06 1.0 undecidable manual P 355 0.2464 104 -0.32 23
IV.MMO1.EHZ. 2021-10-20T01:44:11.98 0.3 undecidable manual S 52 0.0872 139 -0.44 71
IV.FDMO.HHZ. 2021-10-20T01:44:11.68 1.0 undecidable manual P 331 0.2176 107 -0.23 24
IV.MF5.EHZ. 2021-10-20T01:44:11.96 0.3 negative manual P 50 0.2185 106 0.04 75
IV.MTRA.EHZ. 2021-10-20T01:44:10.76 0.3 negative manual P 127 0.1502 119 -0.08 76
IV.MMO1.EHZ. 2021-10-20T01:44:09.80 0.1 undecidable manual P 52 0.0872 139 -0.2 100
IV.MC2.EHZ. 2021-10-20T01:44:09.99 0.1 undecidable manual P 334 0.0728 145 0.15 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.MTRA.HNN. ML:1.9 0.00062 0.18 AML other m 2021-10-20T01:44:13.70
IV.MTRA.EHN. ML:1.9 0.000583 0.18 AML other m 2021-10-20T01:44:13.70
IV.MTRA.HNE. ML:1.9 0.0006675 0.22 AML other m 2021-10-20T01:44:14.23
IV.MTRA.EHE. ML:1.9 0.000668 0.22 AML other m 2021-10-20T01:44:14.12
IV.FDMO.HHN. ML:1.9 0.0004825 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 0.0004675 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 0.0002135 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 0.0005645 0.76 AML other m 2021-10-20T01:44:17.43
IV.SMA1.EHN. ML:1.6 0.0002105 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 0.00104 1.06 AML other m 2021-10-20T01:44:18.03
IV.LNSS.HHE. ML:1.5 0.0001435 0.14 AML other m 2021-10-20T01:44:19.07
IV.GUMA.HHN. ML:2 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 9.215E-5 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 0.00014 0.34 AML other m 2021-10-20T01:44:19.36
IV.GAVE.EHE. ML:1.6 0.0001765 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 0.0001925 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 0.000458 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 0.000781 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:2.1 0.0004005 0.7 AML other m 2021-10-20T01:44:22.45
IV.OFFI.HHE. ML:1.5 0.00010285 0.34 AML other m 2021-10-20T01:44:23.07
IV.ASSB.HHE. ML:1.4 6.185E-5 1.14 AML other m 2021-10-20T01:44:24.67
IV.ASSB.HHN. ML:1.6 9.49E-5 0.26 AML other m 2021-10-20T01:44:24.16
IV.SNTG.HHE. ML:1 2.73E-5 0.8 AML other m 2021-10-20T01:44:24.47
IV.MOMA.HHN. ML:1.2 3.595E-5 0.34 AML other m 2021-10-20T01:44:26.00
IV.SNTG.HHN. ML:1.1 3.09E-5 0.54 AML other m 2021-10-20T01:44:26.56
IV.FOSV.EHE. ML:1.2 2.835E-5 1.16 AML other m 2021-10-20T01:44:26.79
IV.FOSV.EHN. ML:1.5 5.745E-5 1.6 AML other m 2021-10-20T01:44:26.87
IV.CING.HHE. ML:1.4 5.27E-5 0.14 AML other m 2021-10-20T01:44:27.06
IV.CING.HHN. ML:1.3 4.27E-5 0.68 AML other m 2021-10-20T01:44:27.42
IV.MOMA.HHE. ML:1.2 4.105E-5 0.16 AML other m 2021-10-20T01:44:27.55
IV.SSFR.HHN. ML:1.7 7.715E-5 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 4.695E-5 0.92 AML other m 2021-10-20T01:44:30.39
IV.VCEL.EHN. ML:1.5 5.275E-5 0.42 AML other m 2021-10-20T01:44:31.51
IV.MURB.HHN. ML:1.8 8.755E-5 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 8.37E-5 0.28 AML other m 2021-10-20T01:44:31.70
IV.ARVD.HHN. ML:1 1.5277E-5 0.72 AML other m 2021-10-20T01:44:32.36
IV.ARVD.HHE. ML:1 1.705E-5 0.8 AML other m 2021-10-20T01:44:32.67
IV.FAGN.HHN. ML:1.6 6.995E-5 0.62 AML other m 2021-10-20T01:44:32.87
IV.T0110.HHE. ML:1.5 4.185E-5 0.46 AML other m 2021-10-20T01:44:35.60
IV.T0110.HHN. ML:1.6 5.02E-5 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