Earthquake with magnitude of ML 1.6 on date 20-10-2021 and time 03:42:04 (Italy) in region 8 km W Montegallo (AP)

A magnitude ML 1.6 earthquake occured in region: 8 km W Montegallo (AP), on

  • 20-10-2021 01:42:04 (UTC)
  • 20-10-2021 03:42:04 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.853, 13.241 at 13 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 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
Amandola FM 17 3629 17683
Accumoli RI 18 667 18350
Comunanza AP 18 3166 21516
Palmiano AP 19 196 21712
Roccafluvione AP 19 2010 23722

Municipalities with at least 50000 inhabitants

An earthquake occurred to
44 Km NW 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
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 earthquake resentment in the area, expressed in terms of intensity on the MCS scale (Mercalli-Cancani-Sieberg). Intensities are determined using data from questionnaires collected on the website http://www.hsit.it. The intensities shown are determined considering all the reports received from each municipality, and are all the more reliable the greater the number of questionnaires. The collected data are subjected to an automatic statistical filter, but are not checked individually. In particular, intensities greater than or equal to the VI degree of the MCS or EMS scale require on-site verification by specialized personnel. The black star is the epicenter of the earthquake that occurred. This map is updated every time citizens fill out new questionnaires. The number of questionnaires processed to obtain this map, the date and time of the last update are shown at the top right.
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Reviewed
Rev100
ML 1.6 2021-10-20
01:42:04
42.8532 13.2413 13 2021-10-20
01:47:40
Sala Sismica INGV-Roma 96779531
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-10-20 01:42:04 ± 0.07
Latitude 42.8532 ± 0.0036
Longitude 13.2413 ± 0.0061
Depth (km) 13 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 96779531

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 490
Semi-minor axis of confidence ellipse (meter) 98
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 239
Circular confidence region, given by single value of horizontal uncertainty (meter) 490
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 76
Number of associated phases, regardless of their use for origin computation 40
Number of defining phases 23
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.24
Epicentral distance of station closest to the epicenter (degree) 0
Epicentral distance of station farthest from the epicenter (degree) 0.35163
Number of stations at which the event was observed 27
Number of stations from which data was used for origin computation 12
Magnitude information

ML:1.6

Field Value
Value 1.6
Uncertainty 0.3
Num. used stations 42
Type of magnitude ML
Reference to an origin 96779531
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-10-20 01:47:40
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.MURB.HHZ. 2021-10-20T01:42:28.27 3.0 undecidable manual S 0.33 0
IV.MOMA.HHZ. 2021-10-20T01:42:22.48 3.0 undecidable manual S 0.22 0
IV.NARO.HHZ. 2021-10-20T01:42:21.30 3.0 negative manual P -0.07 0
IV.EL6.EHZ. 2021-10-20T01:42:21.84 3.0 undecidable manual S -0.35 0
IV.T0110.HHZ. 2021-10-20T01:42:17.94 3.0 negative manual P -0.64 0
IV.ARVD.HHZ. 2021-10-20T01:42:17.06 3.0 positive manual P -0.62 0
IV.TERO.HHZ. 2021-10-20T01:42:17.24 0.3 undecidable manual S 131 0.3516 95 0.12 71
IV.MURB.HHZ. 2021-10-20T01:42:17.18 3.0 negative manual P -0.18 0
IV.MML1.EHZ. 2021-10-20T01:42:16.36 0.3 undecidable manual S 323 0.3265 96 -0.01 72
IV.VCEL.EHZ. 2021-10-20T01:42:16.42 3.0 negative manual P -0.32 0
IV.FAGN.HHZ. 2021-10-20T01:42:16.40 3.0 negative manual P -0.35 0
IV.FOSV.EHZ. 2021-10-20T01:42:15.23 3.0 undecidable manual P -0.29 0
IV.CESI.HHZ. 2021-10-20T01:42:15.56 0.3 undecidable manual S 302 0.2896 97 0.28 70
IV.LNSS.HHZ. 2021-10-20T01:42:15.87 0.3 undecidable manual S 211 0.2905 97 0.56 66
IV.ATCC.EHZ. 2021-10-20T01:42:15.15 3.0 positive manual P -0.11 0
IV.SMA1.EHZ. 2021-10-20T01:42:13.92 0.3 undecidable manual S 163 0.2329 100 0.29 70
IV.CING.HHZ. 2021-10-20T01:42:13.66 3.0 negative manual P -1.14 0
IV.EL6.EHZ. 2021-10-20T01:42:13.49 3.0 positive manual P -0.64 0
IV.CSP1.EHZ. 2021-10-20T01:42:13.58 0.3 undecidable manual S 354 0.2401 99 -0.25 70
IV.ASSB.HHZ. 2021-10-20T01:42:13.62 3.0 undecidable manual P -0.09 0
IV.MF5.EHZ. 2021-10-20T01:42:13.30 0.3 undecidable manual S 50 0.2086 102 0.37 68
IV.GUMA.HHZ. 2021-10-20T01:42:13.58 0.3 undecidable manual S 18 0.2203 101 0.32 69
IV.TERO.HHZ. 2021-10-20T01:42:11.30 0.3 negative manual P 131 0.3516 95 -0.37 67
IV.RM33.EHZ. 2021-10-20T01:42:11.36 3.0 positive manual P -0.02 0
IV.OFFI.HHZ. 2021-10-20T01:42:11.92 3.0 positive manual P 0.52 0
IV.MNTT.EHZ. 2021-10-20T01:42:11.71 0.1 undecidable manual P 51 0.3327 95 0.37 90
IV.MTRA.EHZ. 2021-10-20T01:42:10.99 0.1 undecidable manual S 130 0.1493 113 -0.24 96
IV.GAVE.EHZ. 2021-10-20T01:42:10.83 3.0 negative manual P 0.18 0
IV.CESI.HHZ. 2021-10-20T01:42:10.44 0.1 positive manual P 302 0.2896 97 -0.16 94
IV.NRCA.HHZ. 2021-10-20T01:42:10.03 0.3 undecidable manual S 258 0.0953 131 0.16 74
IV.MML1.EHZ. 2021-10-20T01:42:10.92 0.6 positive manual P 323 0.3265 96 -0.31 45
IV.LNSS.HHZ. 2021-10-20T01:42:10.56 0.1 positive manual P 211 0.2905 97 -0.06 96
IV.GUMA.HHZ. 2021-10-20T01:42:09.41 0.1 positive manual P 18 0.2203 101 -0.03 99
IV.SMA1.EHZ. 2021-10-20T01:42:09.45 0.1 positive manual P 163 0.2329 100 -0.2 94
IV.MMO1.EHZ. 2021-10-20T01:42:09.36 0.3 undecidable manual S 54 0.0782 138 -0.14 75
IV.CSP1.EHZ. 2021-10-20T01:42:09.44 0.1 undecidable manual P 354 0.2401 99 -0.33 92
IV.MF5.EHZ. 2021-10-20T01:42:09.31 0.3 negative manual P 50 0.2086 102 0.06 73
IV.MTRA.EHZ. 2021-10-20T01:42:08.11 0.1 negative manual P 130 0.1493 113 -0.16 97
IV.NRCA.HHZ. 2021-10-20T01:42:07.58 0.1 negative manual P 258 0.0953 131 0.1 100
IV.MMO1.EHZ. 2021-10-20T01:42:07.10 0.1 undecidable manual P 54 0.0782 138 -0.17 99
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.NRCA.HNE. ML:2 0.000923 0.14 AML other m 2021-10-20T01:42:10.16
IV.NRCA.HHE. ML:2 0.001004 0.14 AML other m 2021-10-20T01:42:10.16
IV.NRCA.HNN. ML:2 0.00119 0.14 AML other m 2021-10-20T01:42:10.21
IV.NRCA.HHN. ML:2.1 0.001375 0.86 AML other m 2021-10-20T01:42:10.21
IV.MTRA.HNN. ML:1.8 0.0004495 0.16 AML other m 2021-10-20T01:42:11.05
IV.MTRA.EHN. ML:1.8 0.000453 0.16 AML other m 2021-10-20T01:42:11.05
IV.MTRA.EHE. ML:1.8 0.000507 0.18 AML other m 2021-10-20T01:42:11.47
IV.MTRA.HNE. ML:1.8 0.000531 0.18 AML other m 2021-10-20T01:42:11.47
IV.MF5.EHN. ML:1.7 0.000317 0.36 AML other m 2021-10-20T01:42:13.60
IV.CSP1.EHN. ML:1.7 0.0002765 0.3 AML other m 2021-10-20T01:42:13.71
IV.GUMA.HNN. ML:1.8 0.000388 1.4 AML other m 2021-10-20T01:42:13.86
IV.MF5.EHE. ML:1.5 0.0001685 0.2 AML other m 2021-10-20T01:42:13.77
IV.CSP1.EHE. ML:1.7 0.0002765 1.5 AML other m 2021-10-20T01:42:13.24
IV.GUMA.HHE. ML:1.9 0.0004905 1.36 AML other m 2021-10-20T01:42:14.83
IV.SMA1.EHE. ML:1.4 0.0001205 1.52 AML other m 2021-10-20T01:42:14.17
IV.SMA1.EHN. ML:1.5 0.0001525 1.5 AML other m 2021-10-20T01:42:14.03
IV.CESI.HHN. ML:1.4 9.835E-5 0.84 AML other m 2021-10-20T01:42:15.74
IV.LNSS.HHE. ML:1.6 0.000162 0.44 AML other m 2021-10-20T01:42:16.02
IV.CESI.HHE. ML:1.4 0.00010175 0.18 AML other m 2021-10-20T01:42:16.37
IV.GUMA.HHN. ML:1.8 0.0003835 0.54 AML other m 2021-10-20T01:42:16.55
IV.GAVE.EHN. ML:1.6 0.0001775 0.28 AML other m 2021-10-20T01:42:16.61
IV.MML1.EHE. ML:1.2 5.765E-5 0.32 AML other m 2021-10-20T01:42:16.64
IV.MML1.EHN. ML:1.3 7.975E-5 0.34 AML other m 2021-10-20T01:42:16.70
IV.LNSS.HHN. ML:1.6 0.0001515 1.14 AML other m 2021-10-20T01:42:16.71
IV.GAVE.EHE. ML:1.6 0.0001445 0.12 AML other m 2021-10-20T01:42:16.87
IV.RM33.EHN. ML:1.6 0.0001245 0.26 AML other m 2021-10-20T01:42:17.40
IV.RM33.EHE. ML:1.4 9.26E-5 0.14 AML other m 2021-10-20T01:42:17.71
IV.GUMA.HNE. ML:1.8 0.000384 1.58 AML other m 2021-10-20T01:42:17.09
IV.MNTT.EHN. ML:1.9 0.00027 0.18 AML other m 2021-10-20T01:42:19.80
IV.MNTT.EHE. ML:2.2 0.000578 0.1 AML other m 2021-10-20T01:42:19.67
IV.OFFI.HHN. ML:1.3 7.89E-5 0.56 AML other m 2021-10-20T01:42:20.33
IV.OFFI.HHE. ML:1.4 8.325E-5 0.44 AML other m 2021-10-20T01:42:20.42
IV.ASSB.HHE. ML:1.2 3.84E-5 0.84 AML other m 2021-10-20T01:42:21.01
IV.ASSB.HHN. ML:1.4 6.615E-5 0.26 AML other m 2021-10-20T01:42:21.50
IV.FOSV.EHN. ML:1.3 4.045E-5 0.4 AML other m 2021-10-20T01:42:24.40
IV.FOSV.EHE. ML:0.9 1.726E-5 0.6 AML other m 2021-10-20T01:42:26.45
IV.MURB.HHN. ML:1.6 5.69E-5 1.72 AML other m 2021-10-20T01:42:28.88
IV.MURB.HHE. ML:1.7 7.885E-5 0.26 AML other m 2021-10-20T01:42:29.08
IV.FAGN.HHE. ML:1.5 5.02E-5 0.26 AML other m 2021-10-20T01:42:29.03
IV.FAGN.HHN. ML:1.4 4.18E-5 1.4 AML other m 2021-10-20T01:42:30.20
IV.T0110.HHN. ML:1.4 3.06E-5 1.34 AML other m 2021-10-20T01:42:31.08
IV.T0110.HHE. ML:1.3 2.655E-5 0.86 AML other m 2021-10-20T01:42:32.94
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