Earthquake with magnitude of ML 1.3 on date 21-10-2021 and time 04:28:27 (UTC) in region 4 km S Arquata del Tronto (AP)

A magnitude ML 1.3 earthquake occured in region: 4 km S Arquata del Tronto (AP), on

  • 21-10-2021 04:28:27 (UTC)
  • 21-10-2021 06:28:27 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.736, 13.294 at 16 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 4 1178 1178
Accumoli RI 6 667 1845
Acquasanta Terme AP 10 2916 4761
Amatrice RI 12 2657 7418
Montegallo AP 12 523 7941
Valle Castellana TE 17 977 8918
Cittareale RI 17 482 9400
Norcia PG 18 4957 14357
Montemonaco AP 19 604 14961
Rocca Santa Maria TE 20 537 15498

Municipalities with at least 50000 inhabitants

An earthquake occurred to
35 Km W of Teramo (54892 inhabitants)
44 Km N of L'Aquila (69753 inhabitants)
54 Km E of Foligno (57155 inhabitants)
56 Km E of Terni (111501 inhabitants)
74 Km W of Montesilvano (53738 inhabitants)
81 Km W of Pescara (121014 inhabitants)
83 Km NW of Chieti (51815 inhabitants)
85 Km E of Perugia (166134 inhabitants)
94 Km NE of Guidonia Montecelio (88673 inhabitants)
95 Km NE of Tivoli (56533 inhabitants)
100 Km S of Ancona (100861 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 1.3 2021-10-21
04:28:27
42.7357 13.2938 16 2021-10-21
04:35:43
Sala Sismica INGV-Roma 96823491
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-10-21 04:28:27 ± 0.2
Latitude 42.7357 ± 0.0063
Longitude 13.2938 ± 0.0073
Depth (km) 16 ± 2 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 96823491

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 724
Semi-minor axis of confidence ellipse (meter) 387
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 50
Circular confidence region, given by single value of horizontal uncertainty (meter) 720
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 143
Number of associated phases, regardless of their use for origin computation 24
Number of defining phases 14
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.19
Epicentral distance of station closest to the epicenter (degree) 0
Epicentral distance of station farthest from the epicenter (degree) 0.33635
Number of stations at which the event was observed 17
Number of stations from which data was used for origin computation 7
Magnitude information

ML:1.3

Field Value
Value 1.3
Uncertainty 0.3
Num. used stations 12
Type of magnitude ML
Reference to an origin 96823491
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-10-21 04:35:43
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.TDS.HHZ. 2021-10-21T04:30:10.80 3.0 undecidable manual Sn -0.26 0
MN.CLTB.HHZ. 2021-10-21T04:29:48.36 3.0 positive manual Pg 8.15 0
IV.MNTV.EHZ. 2021-10-21T04:29:44.59 3.0 undecidable manual Sn -0.76 0
IV.BRMO.HHZ. 2021-10-21T04:29:42.40 3.0 undecidable manual Pg 14.79 0
IV.EUCT.HNZ. 2021-10-21T04:29:33.75 3.0 negative manual Pg 12.63 0
RF.GEPF.HHZ. 2021-10-21T04:29:23.61 3.0 negative manual Pg 4.68 0
IV.CMPR.HHZ. 2021-10-21T04:29:14.98 3.0 undecidable manual Pg 4.5 0
IV.MTMR.EHZ. 2021-10-21T04:29:03.06 3.0 negative manual Pn 1.02 0
IV.VISG.HHZ. 2021-10-21T04:28:56.32 3.0 undecidable manual Pn 0.88 0
IV.FDMO.HHZ. 2021-10-21T04:28:39.67 0.6 undecidable manual S 333 0.3363 100 -0.18 48
IV.MF5.EHZ. 2021-10-21T04:28:38.56 0.6 undecidable manual S 26 0.2797 103 0.36 46
IV.TERO.HHZ. 2021-10-21T04:28:37.19 0.6 undecidable manual S 116 0.2545 105 -0.27 48
IV.MC2.EHZ. 2021-10-21T04:28:35.95 0.6 undecidable manual S 336 0.1916 113 0.23 48
IV.SRES.HHZ. 2021-10-21T04:28:34.43 3.0 undecidable manual P -1.73 0
IV.MMO1.EHZ. 2021-10-21T04:28:34.52 0.6 undecidable manual S 8 0.1655 118 -0.49 46
IV.NRCA.HHZ. 2021-10-21T04:28:34.92 0.1 undecidable manual S 307 0.1646 119 -0.06 100
IV.FDMO.HHZ. 2021-10-21T04:28:34.44 1.0 negative manual P 333 0.3363 100 -0.11 24
IV.SMA1.EHZ. 2021-10-21T04:28:33.69 0.6 undecidable manual S 164 0.1097 133 0.03 51
IV.TERO.HHZ. 2021-10-21T04:28:33.02 0.6 undecidable manual P 116 0.2545 105 -0.16 49
IV.MF5.EHZ. 2021-10-21T04:28:33.82 0.3 positive manual P 26 0.2797 103 0.22 71
IV.MC2.EHZ. 2021-10-21T04:28:32.26 0.6 positive manual P 336 0.1916 113 0.09 50
IV.NRCA.HHZ. 2021-10-21T04:28:31.80 0.3 undecidable manual P 307 0.1646 119 0.06 76
IV.SMA1.EHZ. 2021-10-21T04:28:31.30 0.6 positive manual P 164 0.1097 133 0.32 49
IV.MMO1.EHZ. 2021-10-21T04:28:31.62 0.3 undecidable manual P 8 0.1655 118 -0.14 75
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.SMA1.EHN. ML:1.2 0.00012825 1.68 AML other m 2021-10-21T04:28:33.96
IV.SMA1.EHE. ML:1.1 9.895E-5 1.84 AML other m 2021-10-21T04:28:34.04
IV.NRCA.HHN. ML:1.1 8.63E-5 0.34 AML other m 2021-10-21T04:28:35.10
IV.NRCA.HHE. ML:1.2 9.855E-5 0.06 AML other m 2021-10-21T04:28:35.30
IV.SRES.HHN. ML:1.6 5.535E-5 0.62 AML other m 2021-10-21T04:28:36.42
IV.CSP1.EHN. ML:1.7 0.00015 0.94 AML other m 2021-10-21T04:28:37.25
IV.CSP1.EHE. ML:1.6 0.00012705 0.52 AML other m 2021-10-21T04:28:38.31
IV.SRES.HHE. ML:1.6 5.02E-5 1.6 AML other m 2021-10-21T04:28:43.83
IV.NRCA.HNE. ML:1.3 0.00013633422 0.6496 AML other m 2021-10-21T04:28:39.63
IV.NRCA.HNN. ML:1.4 0.0001873757 1.2 AML other m 2021-10-21T04:28:45.18
IV.TERO.HHE. ML:1 4.720476E-5 0.5792 AML other m 2021-10-21T04:28:46.19
IV.TERO.HHN. ML:0.6 1.8138665E-5 0.1184 AML other m 2021-10-21T04:28:38.29
IV.FDMO.HHE. ML:0.8 1.7513765E-5 0.1216 AML other m 2021-10-21T04:28:40.68
IV.FDMO.HHN. ML:0.8 2.071433E-5 0.2432 AML other m 2021-10-21T04:28:40.04
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