Earthquake with magnitude of ML 2.0 on date 22-09-2019 and time 21:21:41 (Italy) in region 5 km W Samassi (VS)

A magnitude ML 2.0 earthquake occured in region: 5 km W Samassi (VS), on

  • 22-09-2019 19:21:41 (UTC)
  • 22-09-2019 21:21:41 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 39.47, 8.85 at 10 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
Samassi VS 5 5206 5206
Serramanna VS 8 9206 14412
San Gavino Monreale VS 10 8736 23148
Villacidro VS 10 14099 37247
Sanluri VS 11 8532 45779
Serrenti VS 11 4892 50671
Furtei VS 13 1658 52329
Villasor CA 13 6945 59274
Vallermosa CA 13 1924 61198
Nuraminis CA 15 2559 63757
Segariu VS 15 1203 64960
Sardara VS 16 4078 69038
Samatzai CA 16 1700 70738
Gonnosfanadiga VS 16 6633 77371
Decimoputzu CA 17 4425 81796
Pabillonis VS 18 2818 84614
Villanovaforru VS 18 638 85252
Collinas VS 19 857 86109
Pimentel CA 19 1171 87280
Villamar VS 19 2756 90036
San Sperate CA 19 8314 98350
Villaspeciosa CA 19 2516 100866
Monastir CA 19 4577 105443
Guasila CA 20 2691 108134
Siliqua CA 20 3888 112022

Municipalities with at least 50000 inhabitants

An earthquake occurred to
37 Km NW of Cagliari (154460 inhabitants)
39 Km NW of Quartu Sant'Elena (71125 inhabitants)
Recent and historical Seismicity

These maps show the seismicity for different time windows. The earthquake locations reported in these maps are determined in quasi real-time by the personnel on duty in the seismic surveillance center of INGV in Rome. Note that the earthquake source parameters (hypocentral location and magnitude) are the best estimates obstained with the available data and they are adjourned as additional data become available. The source parameters obtained by the personnel on duty are then revised by the group in charge of the INGV Seismic Bulletin (Bollettino Sismico Italiano dell’INGV).

Earthquakes of the last three days (72 hours)

Earthquakes of the last three days (72 hours)

This map reports the earthquake epicenters located in the past 72 hours (3 days) from the time this page has been generated. The radius of the circle representing the earthquake on the map scales with magnitude. The color depends on the time of occurrence of the earthquakes with respect to the time of generation of the map (red = 1 hour; orange = 24 hours; yellow = 72 hours). The open star shows the epicenter of the current earthquake.
Earthquakes of the last 90 days

Earthquakes of the last 90 days

This map reports the Magnitudo ≥ 1.0 earthquake epicenters located using the data acquired by the Italian National Seismic Network and by other collaborating networks in Italy and in the neighbouring countries. The radii of the circles representing the epicenters on the map scale with magnitude. The color of each circle depends on the time of occurrence of the earthquakes with respect to the time of generation of the map (red = 1 hour; orange = 24 hours; yellow = 72 hours; blue = all other earthquakes). The open star shows the epicenter of the current earthquake.
Earthquakes since 1985

Earthquakes since 1985

This map reports the Magnitudo ≥ 2.5 earthquake epicenters located using the data acquired by the Italian National Seismic Network and by other collaborating networks in Italy and in the neighbouring countries. The radii of the circles representing the epicenters on the map scale with magnitude. The color of each circle depends on the time of occurrence of the earthquakes with respect to the time of generation of the map (red = 1 hour; orange = 24 hours; yellow = 72 hours; blue = all other earthquakes). The open star shows the epicenter of the current earthquake.
Earthquakes since 1000 AD until 2014

Earthquakes since 1000 AD until 2014

This map shows the epicenters of the historical earthquakes catalogue CPT15 (Catalogo Parametrico dei Terremoti Italiani, 2015 version https://emidius.mi.ingv.it/CPTI15-DBMI15/) with estimated magnitude ≥ 5.0 since 1000 AD until 2014. The epicenters are represented by squares which sides scale with the estimated earthquake magnitude. For earthquakes with magnitude ≥ 6.0, it is also shown the year of occurrence and the magnitude value. The open star shows the epicenter of the current earthquake.
Seismic hazard

Seismic hazard maps provide probabilistic estimates of the earthquake ground shaking exceeding a given threshold in a given geographic region within a given time window. Thus, it is not a deterministic prediction - a target that may be never reached given the complexity of the earthquake physical phenomenon - nor of the maximum expected earthquake since this has extremely low probabilities to occur.

In 2004, it was published the seismic hazard map of Italy (http://zonesismiche.mi.ingv.it) that provides a picture of the most hazardous geographic regions. The seismic hazard map of Italy (GdL MPS, 2004; rif. Ordinanza PCM del 28 aprile 2006, n. 3519, All. 1b) provides the 10% probability of exceedance in 50 years of the horizontal acceleration at rock sites (i.e., Vs30>800 m/s; cat. A, 3.2.1 of the D.M. 14.09.2005).

The colours indicate the various values of the ground acceleration that have 10% to be exceeded within 50 years. In general, the colours associated to low values of acceleration refer to areas that are less hazardous and stronger earthquakes repeat less frequently although they may still occur.

Seismic hazard map

Seismic hazard map

This map shows the seismic hazard map of Italy for the region where the earthquake occurred.
Shakemap
Felt maps
The earthquake effects in MCS scale as obtained from the compiled questionnaire

The earthquake effects in MCS scale as obtained from the compiled 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
Rev 100 ML 2.0 2019-09-22
19:21:41
39.47 8.85 10 2019-09-22
19:32:09
Sala Sismica INGV-Roma 72669151
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2019-09-22 19:21:41 ± 0.09
Latitude 39.47 ± 0.01
Longitude 8.85 ± 0.01
Depth (km) 10 (operator assigned)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 72669151

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 660
Semi-minor axis of confidence ellipse (meter) 460
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 318
Circular confidence region, given by single value of horizontal uncertainty (meter) 660
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 150
Number of associated phases, regardless of their use for origin computation 15
Number of defining phases 10
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.18
Epicentral distance of station closest to the epicenter (degree) 0
Epicentral distance of station farthest from the epicenter (degree) 1.67004
Number of stations at which the event was observed 10
Number of stations from which data was used for origin computation 5
Magnitude information

ML:2

Field Value
Value 2
Uncertainty 0.1
Num. used stations 8
Type of magnitude ML
Reference to an origin 72669151
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2019-09-22 19:32:09
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.RNI2.HHZ. 2019-09-22T19:23:48.41 3.0 undecidable manual Sn 1.19 0
IV.MCEL.HHZ. 2019-09-22T19:23:18.97 3.0 undecidable manual Pg 15.45 0
IV.MAON.HHZ. 2019-09-22T19:23:18.31 3.0 undecidable manual Sn 1.21 0
GU.GRAM.HHZ. 2019-09-22T19:23:07.45 3.0 positive manual Pg 9.61 0
IV.IFIL.HHZ. 2019-09-22T19:22:57.79 3.0 positive manual Pg 5.76 0
IV.AGLI.HHZ. 2019-09-22T19:22:32.99 0.3 undecidable manual S 8 1.67 38 -0.03 50
IV.DGI.HHZ. 2019-09-22T19:22:14.12 0.3 undecidable manual S 34 1.0234 50 -0.23 61
IV.AGLI.HHZ. 2019-09-22T19:22:11.55 0.3 undecidable manual P 8 1.67 38 0.36 49
IV.DGI.HHZ. 2019-09-22T19:22:00.42 0.3 undecidable manual P 34 1.0234 50 0.02 65
TV.SU26.HHZ. 2019-09-22T19:21:57.12 0.3 undecidable manual S 218 0.4479 50 -0.16 73
MN.VSL.HHZ. 2019-09-22T19:21:55.79 0.3 undecidable manual S 87 0.4083 50 -0.32 68
IV.CGL.BHZ. 2019-09-22T19:21:54.78 0.3 undecidable manual S 107 0.3615 50 0.06 75
TV.SU26.HHZ. 2019-09-22T19:21:50.52 0.3 undecidable manual P 218 0.4479 50 -0.03 74
IV.CGL.BHZ. 2019-09-22T19:21:49.31 0.1 undecidable manual P 107 0.3615 50 0.24 100
MN.VSL.HHZ. 2019-09-22T19:21:49.92 0.1 undecidable manual P 87 0.4083 50 0.05 99
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.CGL.BHE. ML:1.8 0.0002245 0.76 AML other m 2019-09-22T19:21:54.93
IV.CGL.BHN. ML:1.9 0.000266 0.68 AML other m 2019-09-22T19:21:55.01
MN.VSL.HHE. ML:2.1 0.0004055 0.1 AML other m 2019-09-22T19:21:56.07
MN.VSL.HHN. ML:1.9 0.0002365 0.96 AML other m 2019-09-22T19:21:56.94
TV.SU26.HHE. ML:2 0.0002735752 1.5232 AML other m 2019-09-22T19:21:57.18
TV.SU26.HHN. ML:1.8 0.00018540495 0.9088 AML other m 2019-09-22T19:21:57.35
IV.AGLI.HHE. ML:2.1 3.80614175E-5 0.9216 AML other m 2019-09-22T19:22:33.10
IV.AGLI.HHN. ML:2 3.348071E-5 0.7296 AML other m 2019-09-22T19:22:33.80
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
Focal Mechanisms

Focal Mechanisms

This map reports the focal mechanisms since 1977 in the region. The white and red beach ball symbols are mechanisms determined using the Regional Centroid Moment Tensor (RCMT, http://www.bo.ingv.it/RCMT) and are determined for earthquakes with magnitude larger than 4.5 in the Euro-Mediterranenan area. Occasionally, when there is a good source-receiver geometry of the target earthquake, the RCMT can be obtained also for earthquakes with magnitude larger than 4.0. The blue and white beach ball symbols indicate the mechanisms obtained from application of the Time Domain Moment Tensor (TDMT, http://terremoti.ingv.it/tdmt.html). This technique is used for M ≥ 3.5. The size of the beach ball sysmbol scales with the calculated moment magnitude, Mw.
Download
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download
Waveforms Seismic signals in full SEED format Download