Earthquake with magnitude of ML 1.2 on date 26-10-2021 and time 05:03:01 (Italy) in region 6 km W Arquata del Tronto (AP)

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

  • 26-10-2021 03:03:01 (UTC)
  • 26-10-2021 05:03:01 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.797, 13.234 at 10 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
Arquata del Tronto AP 6 1178 1178
Montegallo AP 10 523 1701
Accumoli RI 11 667 2368
Norcia PG 11 4957 7325
Castelsantangelo sul Nera MC 13 281 7606
Montemonaco AP 14 604 8210
Acquasanta Terme AP 15 2916 11126
Ussita MC 18 444 11570
Preci PG 18 724 12294
Montefortino FM 19 1178 13472
Visso MC 19 1107 14579
Amatrice RI 19 2657 17236
Cascia PG 20 3217 20453

Municipalities with at least 50000 inhabitants

An earthquake occurred to
41 Km W of Teramo (54892 inhabitants)
47 Km E of Foligno (57155 inhabitants)
51 Km N of L'Aquila (69753 inhabitants)
55 Km E of Terni (111501 inhabitants)
77 Km E of Perugia (166134 inhabitants)
81 Km W of Montesilvano (53738 inhabitants)
88 Km W of Pescara (121014 inhabitants)
91 Km NW of Chieti (51815 inhabitants)
94 Km S of Ancona (100861 inhabitants)
98 Km NE of Guidonia Montecelio (88673 inhabitants)
99 Km NE of Tivoli (56533 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 2021-10-26
03:03:01
42.7972 13.2337 10 2021-10-26
03:07:48
Sala Sismica INGV-Roma 96992291
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-10-26 03:03:01 ± 0.08
Latitude 42.7972 ± 0.0036
Longitude 13.2337 ± 0.0074
Depth (km) 10 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 96992291

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 561
Semi-minor axis of confidence ellipse (meter) 121
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 75
Circular confidence region, given by single value of horizontal uncertainty (meter) 560
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 25
Number of defining phases 23
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.3
Epicentral distance of station closest to the epicenter (degree) 0
Epicentral distance of station farthest from the epicenter (degree) 0.36962
Number of stations at which the event was observed 14
Number of stations from which data was used for origin computation 12
Magnitude information

ML:1.2

Field Value
Value 1.2
Uncertainty 0.3
Num. used stations 14
Type of magnitude ML
Reference to an origin 96992291
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-10-26 03:07:48
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.RMP.HHZ. 2021-10-26T03:03:35.91 3.0 undecidable manual S -0.34 0
IV.MML1.EHZ. 2021-10-26T03:03:16.00 0.1 undecidable manual S 329 0.3696 50 0.39 87
IV.CESI.HHZ. 2021-10-26T03:03:14.04 0.1 undecidable manual S 311 0.3184 50 -0.04 97
IV.RM33.EHZ. 2021-10-26T03:03:13.04 0.1 undecidable manual S 183 0.2887 50 -0.17 97
IV.CING.HHZ. 2021-10-26T03:03:13.66 3.0 negative manual P 0 0
IV.TERO.HHZ. 2021-10-26T03:03:13.76 0.1 undecidable manual S 123 0.3229 50 -0.47 91
IV.CSP1.EHZ. 2021-10-26T03:03:12.98 0.1 undecidable manual S 356 0.295 50 -0.43 92
IV.LNSS.HHZ. 2021-10-26T03:03:12.02 0.1 undecidable manual S 216 0.241 110 0.33 92
IV.FDMO.HHZ. 2021-10-26T03:03:12.12 0.1 undecidable manual S 336 0.2617 50 -0.31 95
IV.MF5.EHZ. 2021-10-26T03:03:12.90 0.1 undecidable manual S 41 0.2527 109 0.79 77
IV.OFFI.HHZ. 2021-10-26T03:03:10.38 0.3 positive manual P 67 0.3588 50 0.77 57
IV.SMA1.EHZ. 2021-10-26T03:03:09.74 0.1 undecidable manual S 156 0.1826 115 0.12 100
IV.MML1.EHZ. 2021-10-26T03:03:09.84 0.6 positive manual P 329 0.3696 50 0.04 48
IV.TERO.HHZ. 2021-10-26T03:03:08.65 0.3 negative manual P 123 0.3229 50 -0.35 69
IV.CESI.HHZ. 2021-10-26T03:03:08.88 0.3 positive manual P 311 0.3184 50 -0.03 73
IV.CSP1.EHZ. 2021-10-26T03:03:08.29 0.6 positive manual P 356 0.295 50 -0.23 47
IV.RM33.EHZ. 2021-10-26T03:03:08.56 1.0 positive manual P 183 0.2887 50 0.15 24
IV.FDMO.HHZ. 2021-10-26T03:03:07.71 1.0 negative manual P 336 0.2617 50 -0.25 24
IV.MF5.EHZ. 2021-10-26T03:03:07.94 0.6 positive manual P 41 0.2527 109 0.16 48
IV.MMO1.EHZ. 2021-10-26T03:03:07.40 0.1 undecidable manual S 34 0.1232 125 -0.21 94
IV.LNSS.HHZ. 2021-10-26T03:03:07.62 0.1 positive manual P 216 0.241 110 0.09 98
IV.SMA1.EHZ. 2021-10-26T03:03:06.43 0.6 undecidable manual P 156 0.1826 115 0.09 50
IV.NRCA.HNZ. 2021-10-26T03:03:06.69 0.1 undecidable manual S 293 0.0944 132 -0.08 97
IV.MMO1.EHZ. 2021-10-26T03:03:05.14 0.1 undecidable manual P 34 0.1232 125 -0.04 99
IV.NRCA.HNZ. 2021-10-26T03:03:04.88 0.3 negative manual P 293 0.0944 132 0.19 76
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.NRCA.HNE. ML:1.5 0.0003775 1.1 AML other m 2021-10-26T03:03:06.31
IV.NRCA.HHE. ML:1.5 0.0004085 0.78 AML other m 2021-10-26T03:03:06.86
IV.NRCA.HNN. ML:1.5 0.000389 0.94 AML other m 2021-10-26T03:03:06.51
IV.NRCA.HHN. ML:1.5 0.0003715 1.92 AML other m 2021-10-26T03:03:07.96
IV.SMA1.EHE. ML:1 7.625E-5 0.22 AML other m 2021-10-26T03:03:09.76
IV.SMA1.EHN. ML:0.9 5.42E-5 0.52 AML other m 2021-10-26T03:03:10.73
IV.FDMO.HHN. ML:1.1 6.555E-5 0.22 AML other m 2021-10-26T03:03:12.32
IV.FDMO.HHE. ML:1 5.11E-5 0.24 AML other m 2021-10-26T03:03:12.23
IV.LNSS.HHE. ML:1.6 0.0002205 0.12 AML other m 2021-10-26T03:03:12.48
IV.LNSS.HHN. ML:1.6 0.0002415 0.14 AML other m 2021-10-26T03:03:12.54
IV.RM33.EHN. ML:0.9 3.285E-5 1.8 AML other m 2021-10-26T03:03:13.02
IV.CESI.HHE. ML:1 3.93E-5 1.34 AML other m 2021-10-26T03:03:14.81
IV.CESI.HHN. ML:1.2 6.215E-5 0.98 AML other m 2021-10-26T03:03:14.31
IV.RM33.EHE. ML:1 4.16E-5 1.18 AML other m 2021-10-26T03:03:14.78
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