Earthquake with magnitude of ML 1.2 on date 20-10-2021 and time 07:57:44 (Italy) in region 6 km W Montegallo (AP)

A magnitude ML 1.2 earthquake occured in region: 6 km W Montegallo (AP), on

  • 20-10-2021 05:57:44 (UTC)
  • 20-10-2021 07:57:44 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.856, 13.259 at 14 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 6 523 523
Montemonaco AP 8 604 1127
Castelsantangelo sul Nera MC 10 281 1408
Arquata del Tronto AP 10 1178 2586
Montefortino FM 12 1178 3764
Ussita MC 14 444 4208
Norcia PG 15 4957 9165
Acquasanta Terme AP 16 2916 12081
Bolognola MC 16 142 12223
Amandola FM 16 3629 15852
Visso MC 16 1107 16959
Comunanza AP 17 3166 20125
Palmiano AP 17 196 20321
Roccafluvione AP 18 2010 22331
Accumoli RI 18 667 22998
Preci PG 18 724 23722
Venarotta AP 19 2066 25788

Municipalities with at least 50000 inhabitants

An earthquake occurred to
43 Km NW of Teramo (54892 inhabitants)
47 Km E of Foligno (57155 inhabitants)
57 Km N of L'Aquila (69753 inhabitants)
60 Km NE of Terni (111501 inhabitants)
76 Km E of Perugia (166134 inhabitants)
82 Km W of Montesilvano (53738 inhabitants)
87 Km S of Ancona (100861 inhabitants)
89 Km W of Pescara (121014 inhabitants)
93 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 1.2 2021-10-20
05:57:44
42.8562 13.2587 14 2021-10-20
06:25:58
Sala Sismica INGV-Roma 96789231
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-10-20 05:57:44 ± 0.23
Latitude 42.8562 ± 0.0090
Longitude 13.2587 ± 0.0098
Depth (km) 14 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 96789231

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 862
Semi-minor axis of confidence ellipse (meter) 722
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 193
Circular confidence region, given by single value of horizontal uncertainty (meter) 860
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 209
Number of associated phases, regardless of their use for origin computation 32
Number of defining phases 9
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.15
Epicentral distance of station closest to the epicenter (degree) 0
Epicentral distance of station farthest from the epicenter (degree) 0.56927
Number of stations at which the event was observed 26
Number of stations from which data was used for origin computation 5
Magnitude information

ML:1.2

Field Value
Value 1.2
Uncertainty 0.3
Num. used stations 4
Type of magnitude ML
Reference to an origin 96789231
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-10-20 06:25:58
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.SPS2.HHZ. 2021-10-20T05:59:35.47 3.0 undecidable manual Sg 13.69 0
IV.AGLI.HHZ. 2021-10-20T05:59:28.57 3.0 undecidable manual Sg 19.190001 0
IV.USI.HHZ. 2021-10-20T05:59:26.22 3.0 undecidable manual Sg 8.58 0
IV.SARZ.HHZ. 2021-10-20T05:59:24.27 3.0 undecidable manual Sn -1.82 0
IV.ZEN8.EHZ. 2021-10-20T05:59:22.15 3.0 undecidable manual Sn 3.46 0
IV.VENL.EHZ. 2021-10-20T05:59:12.69 3.0 undecidable manual Sg 9.76 0
IV.NOCI.HHZ. 2021-10-20T05:59:12.12 3.0 undecidable manual Sg 5.52 0
IV.TDS.HHZ. 2021-10-20T05:59:08.73 3.0 undecidable manual Sn -5.86 0
IV.SIRI.HNZ. 2021-10-20T05:59:02.33 3.0 undecidable manual Sn 3.2 0
IV.SBPO.HNZ. 2021-10-20T05:58:59.69 3.0 undecidable manual Sn -5.15 0
IV.SGO.HHZ. 2021-10-20T05:58:54.78 3.0 undecidable manual Sg 9.43 0
SI.ROSI.HHZ. 2021-10-20T05:58:48.54 3.0 negative manual Pn 0.73 0
IV.SARZ.HHZ. 2021-10-20T05:58:39.78 3.0 negative manual Pn 1.4 0
IV.MTMR.EHZ. 2021-10-20T05:58:35.01 3.0 undecidable manual Sn 0 0
IV.IMTC.HHZ. 2021-10-20T05:58:26.75 3.0 undecidable manual Sn -2.99 0
OT.OT17.EHZ. 2021-10-20T05:58:12.25 3.0 undecidable manual Pg 6.14 0
IV.TST02.HHZ. 2021-10-20T05:58:10.67 3.0 undecidable manual S 1.95 0
IV.MTL1.HNZ. 2021-10-20T05:58:08.92 3.0 undecidable manual S 0.58 0
IV.PP3.EHZ. 2021-10-20T05:58:01.65 3.0 undecidable manual P 4.98 0
IV.LPEL.HHZ. 2021-10-20T05:57:59.99 3.0 undecidable manual S -3.4 0
IV.RNI2.HHZ. 2021-10-20T05:57:56.23 3.0 negative manual P 0.6 0
IV.FOSV.EHZ. 2021-10-20T05:57:56.05 0.6 undecidable manual P 321 0.5693 94 0.25 87
IV.CSP1.EHZ. 2021-10-20T05:57:54.02 0.6 undecidable manual S 351 0.2383 103 -0.24 93
IV.TST02.HHZ. 2021-10-20T05:57:54.72 3.0 undecidable manual P -0.19 0
IV.GIUL.HHZ. 2021-10-20T05:57:54.03 3.0 negative manual P 0.07 0
IV.MC2.EHZ. 2021-10-20T05:57:50.29 0.6 undecidable manual S 317 0.0755 143 0.22 96
IV.NRCA.HHZ. 2021-10-20T05:57:50.56 0.6 undecidable manual S 258 0.1079 130 -0.19 94
IV.MMO1.EHZ. 2021-10-20T05:57:49.89 0.6 undecidable manual S 49 0.0657 147 -0.03 100
IV.CSP1.EHZ. 2021-10-20T05:57:49.98 1.0 negative manual P 351 0.2383 103 -0.2 47
IV.NRCA.HHZ. 2021-10-20T05:57:48.16 0.6 undecidable manual P 258 0.1079 130 0 99
IV.MMO1.EHZ. 2021-10-20T05:57:47.63 0.6 undecidable manual P 49 0.0657 147 -0.05 100
IV.MC2.EHZ. 2021-10-20T05:57:47.90 0.6 undecidable manual P 317 0.0755 143 0.13 98
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.NRCA.HHE. ML:0.9 6.82E-5 0.44 AML other m 2021-10-20T05:57:50.67
IV.NRCA.HHN. ML:1 8.925E-5 1.14 AML other m 2021-10-20T05:57:51.15
IV.ARVD.HHE. ML:1.5 4.615E-5 0.2 AML other m 2021-10-20T05:58:19.96
IV.ARVD.HHN. ML:1.3 3.23E-5 0.06 AML other m 2021-10-20T05:58:23.11
IV.SBPO.HNE. ML:4.3 0.00242 0.06 AML other m 2021-10-20T05:59:02.01
IV.SIRI.HNE. ML:3.8 0.0005155 0.64 AML other m 2021-10-20T05:59:15.62
IV.SIRI.HNN. ML:3.8 0.000487 0.62 AML other m 2021-10-20T05:59:15.62
IV.SBPO.HNN. ML:3.7 0.0005805 1.34 AML other m 2021-10-20T05:59:23.03
SI.ROSI.HHE. ML:3.8 0.0002435 0.12 AML other m 2021-10-20T05:59:24.83
SI.ROSI.HHN. ML:3.9 0.000269 0.22 AML other m 2021-10-20T06:00:19.57
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