Earthquake with magnitude of ML 1.0 on date 20-10-2021 and time 03:23:52 (Italy) in region 8 km W Montegallo (AP)

A magnitude ML 1.0 earthquake occured in region: 8 km W Montegallo (AP), on

  • 20-10-2021 01:23:52 (UTC)
  • 20-10-2021 03:23:52 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.854, 13.243 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 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 18 196 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)
59 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)
90 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 1.0 2021-10-20
01:23:52
42.8538 13.243 15 2021-10-20
01:41:33
Sala Sismica INGV-Roma 96779081
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-10-20 01:23:52 ± 0.07
Latitude 42.8538 ± 0.0027
Longitude 13.2430 ± 0.0049
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 96779081

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 366
Semi-minor axis of confidence ellipse (meter) 92
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) 370
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 55
Number of associated phases, regardless of their use for origin computation 43
Number of defining phases 43
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.25
Epicentral distance of station closest to the epicenter (degree) 0.07015
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
Magnitude information

ML:1

Field Value
Value 1
Uncertainty 0.3
Num. used stations 27
Type of magnitude ML
Reference to an origin 96779081
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-10-20 01:41:33
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.SNTG.HNE. 2021-10-20T01:24:09.46 0.1 undecidable manual S 331 0.4578 95 0.72 76
IV.GIGS.HHN. 2021-10-20T01:24:08.80 0.1 undecidable manual S 149 0.4685 95 -0.25 89
IV.RM33.EHZ. 2021-10-20T01:24:05.76 0.3 undecidable manual S 183 0.3453 98 0.33 67
IV.TERO.HHZ. 2021-10-20T01:24:05.74 0.3 undecidable manual S 131 0.3516 98 0.13 69
IV.CAMP.HHZ. 2021-10-20T01:24:05.40 0.3 undecidable manual S 159 0.3408 98 0.11 70
IV.LNSS.HHZ. 2021-10-20T01:24:04.18 1.0 undecidable manual S 211 0.2914 100 0.32 23
IV.MML1.EHZ. 2021-10-20T01:24:04.85 0.3 undecidable manual S 323 0.3265 99 -0.03 71
IV.GAVE.EHZ. 2021-10-20T01:24:04.59 0.3 undecidable manual S 238 0.3022 100 0.41 66
IV.CESI.HHZ. 2021-10-20T01:24:03.86 0.3 undecidable manual S 301 0.2896 100 0.05 72
IV.CING.HHZ. 2021-10-20T01:24:02.81 0.1 undecidable manual P 356 0.5225 95 -0.24 88
IV.T1299.HNZ. 2021-10-20T01:24:02.17 0.1 undecidable manual S 173 0.2212 106 0.34 91
IV.GUMA.HHZ. 2021-10-20T01:24:02.10 0.1 undecidable manual S 18 0.2194 106 0.33 91
IV.CSP1.EHZ. 2021-10-20T01:24:02.16 0.1 undecidable manual S 353 0.2392 104 -0.19 94
IV.FDMO.HHZ. 2021-10-20T01:24:01.39 0.1 undecidable manual S 328 0.2149 107 -0.26 92
IV.GIGS.HHN. 2021-10-20T01:24:01.69 0.3 undecidable manual P 149 0.4685 95 -0.44 64
IT.MTCL.HGZ. 2021-10-20T01:24:01.72 0.3 undecidable manual S 308 0.2266 105 -0.26 69
IV.MF5.EHZ. 2021-10-20T01:24:01.81 0.1 undecidable manual S 50 0.2077 108 0.37 91
IV.SMA1.EHZ. 2021-10-20T01:24:01.94 0.3 undecidable manual S 163 0.2329 105 -0.23 70
IV.SNTG.HNE. 2021-10-20T01:24:01.78 0.1 undecidable manual P 331 0.4578 95 -0.17 90
IV.OFFI.HHZ. 2021-10-20T01:24:00.47 0.1 undecidable manual P 76 0.3345 98 0.62 81
IV.TERO.HHZ. 2021-10-20T01:24:00.11 0.1 undecidable manual P 131 0.3516 98 -0.03 95
IV.MNTT.EHZ. 2021-10-20T01:24:00.29 0.3 undecidable manual P 51 0.331 99 0.49 64
IV.GAVE.EHZ. 2021-10-20T01:23:59.47 0.3 undecidable manual P 238 0.3022 100 0.15 70
IV.CAMP.HHZ. 2021-10-20T01:23:59.66 0.1 undecidable manual P 159 0.3408 98 -0.3 90
IV.CESI.HHZ. 2021-10-20T01:23:59.00 0.1 undecidable manual P 301 0.2896 100 -0.1 95
IV.RM33.EHZ. 2021-10-20T01:23:59.92 0.1 undecidable manual P 183 0.3453 98 -0.12 93
IV.LNSS.HHZ. 2021-10-20T01:23:59.12 0.1 undecidable manual P 211 0.2914 100 -0.01 96
IV.MTRA.HNZ. 2021-10-20T01:23:59.57 0.1 undecidable manual S 131 0.1484 119 -0.27 93
IV.MML1.EHZ. 2021-10-20T01:23:59.48 0.1 undecidable manual P 323 0.3265 99 -0.24 91
IV.SMA1.EHZ. 2021-10-20T01:23:58.03 0.1 undecidable manual P 163 0.2329 105 -0.13 95
IV.CSP1.EHZ. 2021-10-20T01:23:58.03 0.1 undecidable manual P 353 0.2392 104 -0.23 93
IV.MC2.EHZ. 2021-10-20T01:23:58.32 0.3 undecidable manual S 326 0.0701 146 0.23 73
IV.NRCA.HHZ. 2021-10-20T01:23:58.57 0.1 undecidable manual S 258 0.0962 135 -0.03 98
IV.T1299.HNZ. 2021-10-20T01:23:58.01 0.1 undecidable manual P 173 0.2212 106 0.05 97
IV.MMO1.EHZ. 2021-10-20T01:23:57.86 0.1 undecidable manual S 53 0.0764 143 -0.35 92
IV.FDMO.HHZ. 2021-10-20T01:23:57.61 0.1 undecidable manual P 328 0.2149 107 -0.25 93
IT.MTCL.HGZ. 2021-10-20T01:23:57.86 0.1 undecidable manual P 308 0.2266 105 -0.19 94
IV.MF5.EHZ. 2021-10-20T01:23:57.88 0.1 undecidable manual P 50 0.2077 108 0.14 95
IV.GUMA.HHZ. 2021-10-20T01:23:57.98 0.1 positive manual P 18 0.2194 106 0.05 96
IV.MTRA.HNZ. 2021-10-20T01:23:56.64 0.3 undecidable manual P 131 0.1484 119 -0.17 72
IV.NRCA.HHZ. 2021-10-20T01:23:56.13 0.1 undecidable manual P 258 0.0962 135 0.04 100
IV.MMO1.EHZ. 2021-10-20T01:23:55.70 0.1 undecidable manual P 53 0.0764 143 -0.17 97
IV.MC2.EHZ. 2021-10-20T01:23:55.92 0.1 undecidable manual P 326 0.0701 146 0.12 99
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.NRCA.HHE. ML:1.5 0.00028975695 0.06 AML other m 2021-10-20T01:23:58.74
IV.NRCA.HHN. ML:1.6 0.00033301095 0.1 AML other m 2021-10-20T01:23:59.22
IV.FDMO.HHN. ML:1.2 0.00010015 0.22 AML other m 2021-10-20T01:24:01.58
IV.FDMO.HHE. ML:0.8 3.426228E-5 0.1 AML other m 2021-10-20T01:24:01.61
IV.SMA1.EHN. ML:0.8 3.486458E-5 0.1 AML other m 2021-10-20T01:24:02.60
IV.GUMA.HHE. ML:1.3 0.00010870306 0.2 AML other m 2021-10-20T01:24:02.35
IV.SMA1.EHE. ML:0.9 4.055E-5 0.08 AML other m 2021-10-20T01:24:02.71
IV.LNSS.HHE. ML:0.9 3.42E-5 1.88 AML other m 2021-10-20T01:24:04.99
IV.GUMA.HHN. ML:1.2 9.04E-5 1.46 AML other m 2021-10-20T01:24:05.12
IV.GAVE.EHN. ML:1.1 5.165E-5 0.26 AML other m 2021-10-20T01:24:05.19
IV.MML1.EHE. ML:0.6 1.67641665E-5 0.1 AML other m 2021-10-20T01:24:05.52
IV.MML1.EHN. ML:0.7 1.9248938E-5 0.14 AML other m 2021-10-20T01:24:05.10
IV.LNSS.HHN. ML:0.9 3.7250045E-5 0.14 AML other m 2021-10-20T01:24:04.81
IV.GAVE.EHE. ML:0.9 3.525E-5 1.42 AML other m 2021-10-20T01:24:06.00
IV.RM33.EHN. ML:1.2 4.76E-5 1.76 AML other m 2021-10-20T01:24:06.11
IV.RM33.EHE. ML:0.9 3.225E-5 0.12 AML other m 2021-10-20T01:24:06.36
IV.MNTT.EHE. ML:0 0.0001604291 0.1 AML other m 2021-10-20T01:24:08.24
IV.MNTT.EHN. ML:0 7.87405E-5 0.24 AML other m 2021-10-20T01:24:08.37
IV.NRCA.HNE. ML:1.5 0.0003140853 0.1504 AML other m 2021-10-20T01:23:58.67
IV.NRCA.HNN. ML:1.5 0.0002968222 0.08 AML other m 2021-10-20T01:23:59.21
IV.MF5.EHE. ML:0.8 3.87463855E-5 0.18 AML other m 2021-10-20T01:24:02.35
IV.MF5.EHN. ML:0.9 4.6962165E-5 0.18 AML other m 2021-10-20T01:24:02.26
IV.CESI.HHE. ML:0.9 2.8733285E-5 0.18 AML other m 2021-10-20T01:24:04.95
IV.CESI.HHN. ML:0.9 2.8717885E-5 0.16 AML other m 2021-10-20T01:24:04.32
IV.TERO.HHN. ML:1 3.4283735E-5 0.08 AML other m 2021-10-20T01:24:06.56
IV.CING.HHE. ML:0.7 1.02969984E-5 0.12 AML other m 2021-10-20T01:24:12.98
IV.CING.HHN. ML:0.7 8.791628E-6 0.12 AML other m 2021-10-20T01:24:13.34
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