Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 0.9 on date 07-11-2021 and time 14:27:55 (UTC) in region 5 km NW Acquasanta Terme (AP)

A magnitude ML 0.9 earthquake occured in region: 5 km NW Acquasanta Terme (AP), on

  • 07-11-2021 14:27:55 (UTC)
  • 07-11-2021 15:27:55 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.8120, 13.3920 at 24 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.

Hai sentito il terremoto? Clicca qui

Did you feel it? Fill in the questionnaire.

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 5 2916 2916
Montegallo AP 6 523 3439
Roccafluvione AP 9 2010 5449
Arquata del Tronto AP 9 1178 6627
Montemonaco AP 11 604 7231
Palmiano AP 11 196 7427
Venarotta AP 11 2066 9493
Valle Castellana TE 12 977 10470
Montefortino FM 15 1178 11648
Ascoli Piceno AP 16 49407 61055
Comunanza AP 16 3166 64221
Accumoli RI 18 667 64888
Rocca Santa Maria TE 18 537 65425
Force AP 19 1354 66779
Amandola FM 19 3629 70408
Folignano AP 20 9241 79649

Municipalities with at least 50000 inhabitants

An earthquake occurred to
31 Km NW of Teramo (54892 inhabitants)
51 Km N of L'Aquila (69753 inhabitants)
58 Km E of Foligno (57155 inhabitants)
67 Km E of Terni (111501 inhabitants)
70 Km W of Montesilvano (53738 inhabitants)
78 Km NW of Pescara (121014 inhabitants)
82 Km NW of Chieti (51815 inhabitants)
88 Km E of Perugia (166134 inhabitants)
90 Km S of Ancona (100861 inhabitants)
Recent and historical seismicity
Seismic hazard
Shakemap
Felt maps
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Reviewed
Rev100 		ML 0.9 2021-11-07
14:27:55		 42.8122 13.3922 24 2021-11-07
14:32:20		 Sala Sismica INGV-Roma 97317331
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-11-07 14:27:55 ± 0.09
Latitude 42.8122 ± 0.0036
Longitude 13.3922 ± 0.0049
Depth (km) 24 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 97317331

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 456
Semi-minor axis of confidence ellipse (meter) 319
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 327
Circular confidence region, given by single value of horizontal uncertainty (meter) 460.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 125
Number of associated phases, regardless of their use for origin computation 13
Number of defining phases 10
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.07
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.33005
Number of stations at which the event was observed 10
Number of stations from which data was used for origin computation 7
Magnitude information

ML:0.9

Field Value
Value 0.9
Uncertainty 0.2
Num. used stations 7
Type of magnitude ML
Reference to an origin 97317331
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-11-07 14:32:20
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.SACS.HHZ. 2021-11-07T14:28:33.90 3.0 undecidable manual Sg 0.1 0
IV.RIBO.EHZ.01 2021-11-07T14:28:31.43 3.0 undecidable manual Pg 5.26 0
IV.NARO.HHZ. 2021-11-07T14:28:28.56 3.0 undecidable manual S -2.87 0
IV.MF5.EHZ. 2021-11-07T14:28:05.09 0.1 undecidable manual S 16 20.2686 135 0 100
IV.MC2.EHZ. 2021-11-07T14:28:05.01 0.3 undecidable manual S 304 19.869 136 0 75
IV.NRCA.HHZ. 2021-11-07T14:28:05.53 0.3 undecidable manual S 276 22.755 131 -0.04 74
IV.RM33.EHZ. 2021-11-07T14:28:03.12 0.6 undecidable manual P 203 36.6411 117 -0.02 48
IV.CSP1.EHZ. 2021-11-07T14:28:02.73 1.0 negative manual P 334 34.5432 118 -0.13 24
IV.FDMO.HHZ. 2021-11-07T14:28:02.84 0.6 positive manual P 315 35.1426 118 -0.09 48
IV.MC2.EHZ. 2021-11-07T14:28:01.17 0.1 positive manual P 304 19.869 136 0.14 97
IV.NRCA.HHZ. 2021-11-07T14:28:01.33 0.1 positive manual P 276 22.755 131 -0.03 99
IV.TERO.HHZ. 2021-11-07T14:28:01.89 0.3 undecidable manual P 141 27.1506 125 0 74
IV.MF5.EHZ. 2021-11-07T14:28:01.06 0.6 negative manual P 16 20.2686 135 -0.02 50
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.NRCA.HHN. ML:1.1 0.00006105 1.26 AML other m 2021-11-07T14:28:06.17
IV.NRCA.HHE. ML:1.1 0.00005915000000000001 0.2 AML other m 2021-11-07T14:28:06.08
IV.TERO.HHN. ML:0.6 0.00001454282 0.1216 AML other m 2021-11-07T14:28:06.59
IV.FDMO.HHE. ML:0.9 0.000024310480000000002 0.1984 AML other m 2021-11-07T14:28:08.58
IV.FDMO.HHN. ML:0.9 0.00002271401 0.1024 AML other m 2021-11-07T14:28:08.87
IV.RM33.EHE. ML:0.8 0.0000195266555 0.2176 AML other m 2021-11-07T14:28:09.76
IV.RM33.EHN. ML:0.8 0.000022401114 0.2048 AML other m 2021-11-07T14:28:09.57
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