Earthquake with magnitude of ML 1.3 on date 08-10-2021 and time 21:32:33 (Italy) in region 8 km W Arquata del Tronto (AP)

A magnitude ML 1.3 earthquake occured in region: 8 km W Arquata del Tronto (AP), on

  • 08-10-2021 19:32:33 (UTC)
  • 08-10-2021 21:32:33 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.79, 13.2 at 11 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 8 1178 1178
Norcia PG 9 4957 6135
Accumoli RI 11 667 6802
Castelsantangelo sul Nera MC 12 281 7083
Montegallo AP 12 523 7606
Montemonaco AP 16 604 8210
Preci PG 16 724 8934
Cascia PG 17 3217 12151
Acquasanta Terme AP 17 2916 15067
Ussita MC 18 444 15511
Visso MC 18 1107 16618
Amatrice RI 19 2657 19275
Cittareale RI 19 482 19757

Municipalities with at least 50000 inhabitants

An earthquake occurred to
44 Km W of Teramo (54892 inhabitants)
44 Km E of Foligno (57155 inhabitants)
51 Km NW of L'Aquila (69753 inhabitants)
52 Km E of Terni (111501 inhabitants)
75 Km E of Perugia (166134 inhabitants)
84 Km W of Montesilvano (53738 inhabitants)
91 Km W of Pescara (121014 inhabitants)
93 Km NW of Chieti (51815 inhabitants)
96 Km S of Ancona (100861 inhabitants)
96 Km NE of Guidonia Montecelio (88673 inhabitants)
98 Km NE of Tivoli (56533 inhabitants)
99 Km E of Viterbo (67173 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 2021-10-08
19:32:33
42.7898 13.1998 11 2021-10-08
19:38:42
Sala Sismica INGV-Roma 96353481
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-10-08 19:32:33 ± 0.06
Latitude 42.7898 ± 0.0045
Longitude 13.1998 ± 0.0061
Depth (km) 11 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 96353481

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 564
Semi-minor axis of confidence ellipse (meter) 334
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 319
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) 93
Number of associated phases, regardless of their use for origin computation 11
Number of defining phases 11
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.17
Epicentral distance of station closest to the epicenter (degree) 0.07644
Epicentral distance of station farthest from the epicenter (degree) 0.34084
Number of stations at which the event was observed 6
Number of stations from which data was used for origin computation 6
Magnitude information

ML:1.3

Field Value
Value 1.3
Uncertainty 0.1
Num. used stations 2
Type of magnitude ML
Reference to an origin 96353481
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-10-08 19:38:42
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.CSP1.EHZ. 2021-10-08T19:32:44.93 0.3 undecidable manual S 1 0.3022 50 0.05 73
IV.GAVE.EHZ. 2021-10-08T19:32:43.54 0.3 undecidable manual S 247 0.2446 50 0.36 69
IV.LNSS.HHZ. 2021-10-08T19:32:42.47 0.3 undecidable manual S 212 0.2203 50 0 75
IV.MMO1.EHZ. 2021-10-08T19:32:40.17 0.3 undecidable manual S 40 0.1439 124 0.07 75
IV.TERO.HHZ. 2021-10-08T19:32:40.75 0.1 undecidable manual P 119 0.3408 50 0.06 96
IV.CSP1.EHZ. 2021-10-08T19:32:39.87 0.1 undecidable manual P 1 0.3022 50 -0.17 95
IV.LNSS.HHZ. 2021-10-08T19:32:38.48 0.1 undecidable manual P 212 0.2203 50 -0.17 96
IV.NRCA.HHZ. 2021-10-08T19:32:38.05 0.3 undecidable manual S 305 0.0764 142 -0.13 75
IV.GAVE.EHZ. 2021-10-08T19:32:38.90 0.1 undecidable manual P 247 0.2446 50 -0.16 96
IV.MMO1.EHZ. 2021-10-08T19:32:37.32 0.1 undecidable manual P 40 0.1439 124 0.05 100
IV.NRCA.HHZ. 2021-10-08T19:32:36.30 0.1 undecidable manual P 305 0.0764 142 0.13 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.NRCA.HHE. ML:1.3 0.0002635 0.14 AML other m 2021-10-08T19:32:38.17
IV.NRCA.HHN. ML:1.2 0.00021 0.86 AML other m 2021-10-08T19:32:38.31
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