Earthquake with magnitude of ML 1.4 on date 22-10-2021 and time 15:43:21 (Italy) in region 3 km W Acquasanta Terme (AP)

A magnitude ML 1.4 earthquake occured in region: 3 km W Acquasanta Terme (AP), on

  • 22-10-2021 13:43:21 (UTC)
  • 22-10-2021 15:43:21 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.761, 13.378 at 18 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
Acquasanta Terme AP 3 2916 2916
Arquata del Tronto AP 7 1178 4094
Montegallo AP 10 523 4617
Valle Castellana TE 10 977 5594
Accumoli RI 13 667 6261
Roccafluvione AP 14 2010 8271
Rocca Santa Maria TE 15 537 8808
Montemonaco AP 16 604 9412
Amatrice RI 16 2657 12069
Venarotta AP 17 2066 14135
Palmiano AP 17 196 14331
Cortino TE 19 656 14987
Ascoli Piceno AP 19 49407 64394

Municipalities with at least 50000 inhabitants

An earthquake occurred to
29 Km W of Teramo (54892 inhabitants)
46 Km N of L'Aquila (69753 inhabitants)
59 Km E of Foligno (57155 inhabitants)
64 Km E of Terni (111501 inhabitants)
69 Km W of Montesilvano (53738 inhabitants)
76 Km W of Pescara (121014 inhabitants)
79 Km NW of Chieti (51815 inhabitants)
89 Km E of Perugia (166134 inhabitants)
96 Km S of Ancona (100861 inhabitants)
100 Km NE of Guidonia Montecelio (88673 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 1.4 2021-10-22
13:43:21
42.7608 13.3778 18 2021-10-22
13:51:05
Sala Sismica INGV-Roma 96878581
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-10-22 13:43:21 ± 0.09
Latitude 42.7608 ± 0.0036
Longitude 13.3778 ± 0.0073
Depth (km) 18 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 96878581

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 512
Semi-minor axis of confidence ellipse (meter) 390
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 68
Circular confidence region, given by single value of horizontal uncertainty (meter) 510
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 92
Number of associated phases, regardless of their use for origin computation 19
Number of defining phases 19
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.16
Epicentral distance of station closest to the epicenter (degree) 0.01439
Epicentral distance of station farthest from the epicenter (degree) 0.35433
Number of stations at which the event was observed 11
Number of stations from which data was used for origin computation 11
Magnitude information

ML:1.4

Field Value
Value 1.4
Uncertainty 0.1
Num. used stations 6
Type of magnitude ML
Reference to an origin 96878581
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-10-22 13:51:05
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.FDMO.HHZ. 2021-10-22T13:43:34.11 0.6 undecidable manual S 322 0.348 105 -0.19 47
IV.MF5.EHZ. 2021-10-22T13:43:31.56 0.6 undecidable manual S 15 0.2347 115 0.43 45
IV.CAMP.HHZ. 2021-10-22T13:43:31.10 0.6 undecidable manual S 174 0.2257 116 0.2 48
IV.TERO.HHZ. 2021-10-22T13:43:30.55 0.6 undecidable manual S 130 0.2158 118 -0.09 50
IV.NRCA.HHZ. 2021-10-22T13:43:30.31 0.6 undecidable manual S 291 0.2068 119 -0.08 49
IV.MC2.EHZ. 2021-10-22T13:43:30.57 0.6 undecidable manual S 317 0.2041 119 0.23 48
IV.CSP1.EHZ. 2021-10-22T13:43:28.72 0.3 undecidable manual P 339 0.3543 105 -0.17 71
IV.GIGS.HHE. 2021-10-22T13:43:28.52 0.3 undecidable manual P 155 0.339 106 -0.13 72
IV.SMA1.EHZ. 2021-10-22T13:43:28.60 0.3 undecidable manual S 193 0.134 134 -0.05 76
IV.FDMO.HHZ. 2021-10-22T13:43:28.54 0.3 undecidable manual P 322 0.348 105 -0.25 70
IV.LNSS.HHZ. 2021-10-22T13:43:28.18 0.3 undecidable manual P 238 0.2941 109 0.28 71
IV.MF5.EHZ. 2021-10-22T13:43:27.14 0.1 undecidable manual P 15 0.2347 115 0.18 96
IV.MC2.EHZ. 2021-10-22T13:43:26.51 0.3 undecidable manual P 317 0.2041 119 0.01 76
IV.MTRA.EHZ. 2021-10-22T13:43:26.73 0.6 undecidable manual S 107 0.0144 174 -0.32 50
IV.TERO.HHZ. 2021-10-22T13:43:26.72 0.1 undecidable manual P 130 0.2158 118 0.04 100
IV.CAMP.HHZ. 2021-10-22T13:43:26.82 0.1 undecidable manual P 174 0.2257 116 -0.01 100
IV.NRCA.HHZ. 2021-10-22T13:43:26.43 0.3 undecidable manual P 291 0.2068 119 -0.1 74
IV.SMA1.EHZ. 2021-10-22T13:43:25.67 0.3 undecidable manual P 193 0.134 134 0.14 75
IV.MTRA.EHZ. 2021-10-22T13:43:24.51 0.3 undecidable manual P 107 0.0144 174 -0.09 77
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.MTRA.EHN. ML:1.4 0.000236 0.1 AML other m 2021-10-22T13:43:26.87
IV.MTRA.EHE. ML:1.4 0.000226 0.06 AML other m 2021-10-22T13:43:26.86
IV.NRCA.HHE. ML:1.6 0.000204 0.12 AML other m 2021-10-22T13:43:30.35
IV.NRCA.HHN. ML:1.5 0.0001585 0.1 AML other m 2021-10-22T13:43:30.52
IV.MTRA.HNE. ML:1.4 0.0002199025 0.0704 AML other m 2021-10-22T13:43:26.85
IV.MTRA.HNN. ML:1.4 0.00025838785 0.1216 AML other m 2021-10-22T13:43:26.81
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