Earthquake with magnitude of ML 1.1 on date 27-09-2021 and time 00:59:42 (Italy) in region 6 km W Roccaraso (AQ)

A magnitude ML 1.1 earthquake occured in region: 6 km W Roccaraso (AQ), on

  • 26-09-2021 22:59:42 (UTC)
  • 27-09-2021 00:59:42 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 41.829, 14.015 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
Roccaraso AQ 6 1627 1627
Rivisondoli AQ 6 700 2327
Barrea AQ 8 726 3053
Pescocostanzo AQ 8 1128 4181
Castel di Sangro AQ 9 6538 10719
Villetta Barrea AQ 9 653 11372
Civitella Alfedena AQ 9 296 11668
Scontrone AQ 9 574 12242
Alfedena AQ 11 864 13106
Rocca Pia AQ 12 178 13284
Montenero Val Cocchiara IS 13 538 13822
Scanno AQ 14 1847 15669
San Pietro Avellana IS 15 503 16172
Ateleta AQ 16 1181 17353
Opi AQ 16 420 17773
Rionero Sannitico IS 17 1118 18891
Pettorano sul Gizio AQ 17 1376 20267
Pizzone IS 18 329 20596
Castel del Giudice IS 18 346 20942
Gamberale CH 18 320 21262
Pescasseroli AQ 19 2203 23465
Villalago AQ 19 568 24033
Castel San Vincenzo IS 20 516 24549
Cansano AQ 20 274 24823

Municipalities with at least 50000 inhabitants

An earthquake occurred to
60 Km S of Chieti (51815 inhabitants)
73 Km S of Pescara (121014 inhabitants)
77 Km S of Montesilvano (53738 inhabitants)
77 Km SE of L'Aquila (69753 inhabitants)
88 Km NW of Caserta (76326 inhabitants)
96 Km S of Teramo (54892 inhabitants)
96 Km N of Aversa (53047 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 earthquake resentment in the area, expressed in terms of intensity on the MCS scale (Mercalli-Cancani-Sieberg). Intensities are determined using data from questionnaires collected on the website http://www.hsit.it. The intensities shown are determined considering all the reports received from each municipality, and are all the more reliable the greater the number of questionnaires. The collected data are subjected to an automatic statistical filter, but are not checked individually. In particular, intensities greater than or equal to the VI degree of the MCS or EMS scale require on-site verification by specialized personnel. The black star is the epicenter of the earthquake that occurred. This map is updated every time citizens fill out new questionnaires. The number of questionnaires processed to obtain this map, the date and time of the last update are shown at the top right.
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Reviewed
Rev100
ML 1.1 2021-09-26
22:59:42
41.8287 14.0153 16 2021-09-26
23:05:46
Sala Sismica INGV-Roma 95922031
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-09-26 22:59:42 ± 0.11
Latitude 41.8287 ± 0.0045
Longitude 14.0153 ± 0.0048
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 95922031

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 399
Semi-minor axis of confidence ellipse (meter) 388
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 208
Circular confidence region, given by single value of horizontal uncertainty (meter) 400
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 106
Number of associated phases, regardless of their use for origin computation 16
Number of defining phases 16
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) 0.14749
Epicentral distance of station farthest from the epicenter (degree) 0.29498
Number of stations at which the event was observed 8
Number of stations from which data was used for origin computation 8
Magnitude information

ML:1.1

Field Value
Value 1.1
Uncertainty 0.3
Num. used stations 20
Type of magnitude ML
Reference to an origin 95922031
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-09-26 23:05:46
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.VVLD.HHZ. 2021-09-26T22:59:53.42 0.3 undecidable manual S 278 0.295 103 -0.17 71
IV.LPEL.HHZ. 2021-09-26T22:59:52.17 0.3 undecidable manual S 30 0.2509 107 -0.17 71
IV.POFI.HHZ. 2021-09-26T22:59:52.24 0.3 undecidable manual S 244 0.2518 106 -0.12 72
IV.MIDA.HHZ. 2021-09-26T22:59:52.24 0.6 undecidable manual S 136 0.2581 106 -0.28 46
IV.INTR.HHZ. 2021-09-26T22:59:51.18 0.3 undecidable manual S 336 0.2005 113 0.25 71
IV.CERA.HHZ. 2021-09-26T22:59:51.94 0.3 undecidable manual S 179 0.2302 109 0.18 72
IT.OPI.HGZ. 2021-09-26T22:59:49.60 0.3 undecidable manual S 249 0.1475 123 0.06 74
IV.RNI2.HNZ. 2021-09-26T22:59:49.84 0.6 undecidable manual S 141 0.1619 120 -0.05 50
IV.LPEL.HHZ. 2021-09-26T22:59:48.07 0.3 negative manual P 30 0.2509 107 0 73
IV.POFI.HHZ. 2021-09-26T22:59:48.10 0.6 positive manual P 244 0.2518 106 0.01 49
IV.VVLD.HHZ. 2021-09-26T22:59:48.56 0.3 negative manual P 278 0.295 103 -0.23 69
IV.MIDA.HHZ. 2021-09-26T22:59:47.98 0.6 negative manual P 136 0.2581 106 -0.21 47
IV.RNI2.HNZ. 2021-09-26T22:59:47.07 0.6 undecidable manual P 141 0.1619 120 0.41 46
IV.INTR.HHZ. 2021-09-26T22:59:47.36 0.3 negative manual P 336 0.2005 113 0.1 73
IV.CERA.HHZ. 2021-09-26T22:59:47.80 0.3 undecidable manual P 179 0.2302 109 0.06 74
IT.OPI.HGZ. 2021-09-26T22:59:46.51 0.1 undecidable manual P 249 0.1475 123 0.05 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.LPEL.HHN. ML:1.1 6.42E-5 0.14 AML other m 2021-09-26T22:59:52.65
IV.LPEL.HHE. ML:1.1 6.467662E-5 0.1024 AML other m 2021-09-26T22:59:53.25
IV.VVLD.HHE. ML:1.1 5.075E-5 0.62 AML other m 2021-09-26T22:59:53.89
IV.POFI.HHE. ML:0.7 2.67E-5 0.72 AML other m 2021-09-26T22:59:54.02
IV.VVLD.HHN. ML:0.9 3.720107E-5 0.1536 AML other m 2021-09-26T22:59:54.18
IV.POFI.HHN. ML:0.5 1.633672E-5 0.2176 AML other m 2021-09-26T22:59:53.23
IV.INTR.HHE. ML:0.7 2.855292E-5 0.1024 AML other m 2021-09-26T22:59:51.79
IV.INTR.HHN. ML:0.7 3.215595E-5 0.1024 AML other m 2021-09-26T22:59:51.93
IV.INTR.HNE. ML:1.6 0.0002123085 1.408 AML other m 2021-09-26T22:59:49.70
IV.INTR.HNN. ML:1.2 9.80359E-5 0.8704 AML other m 2021-09-26T23:00:00.00
IV.CERA.HHE. ML:0.6 1.8640285E-5 0.2432 AML other m 2021-09-26T22:59:53.83
IV.CERA.HHN. ML:0.8 2.961067E-5 0.1792 AML other m 2021-09-26T22:59:53.89
IV.CERA.HNE. ML:0.9 4.7148315E-5 0.8832 AML other m 2021-09-26T22:59:57.98
IV.CERA.HNN. ML:1.1 6.4424155E-5 0.7168 AML other m 2021-09-26T22:59:52.77
IV.MIDA.HHE. ML:0.3 1.16700315E-5 0.1408 AML other m 2021-09-26T22:59:54.74
IV.MIDA.HHN. ML:0.5 1.612003E-5 0.0896 AML other m 2021-09-26T22:59:53.02
IV.MIDA.HNE. ML:0.7 2.38385205E-5 0.512 AML other m 2021-09-26T23:00:01.36
IV.MIDA.HNN. ML:1.7 0.00023435379 0.8704 AML other m 2021-09-26T22:59:47.81
IV.LPEL.HNE. ML:1.4 0.000108057165 0.4608 AML other m 2021-09-26T22:59:57.09
IV.LPEL.HNN. ML:1.4 0.0001285094 0.4992 AML other m 2021-09-26T23:00:00.44
IV.POFI.HNE. ML:1.4 0.00011031107 0.5376 AML other m 2021-09-26T22:59:55.22
IV.POFI.HNN. ML:1.5 0.00014435491 0.8448 AML other m 2021-09-26T22:59:55.81
IV.VVLD.HNE. ML:1.4 9.3372705E-5 0.7936 AML other m 2021-09-26T23:00:03.60
IV.VVLD.HNN. ML:1.4 9.3678275E-5 0.4608 AML other m 2021-09-26T22:59:54.11
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