Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of Md 3.1 on date 29-10-1999 and time 19:50:01 (Italy) in region 5 km W Pomarance (PI)

A magnitude Md 3.1 earthquake occured in region: 5 km W Pomarance (PI), on

  • 29-10-1999 17:50:01 (UTC)
  • 29-10-1999 19:50:01 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 43.2990, 10.8130 at 3 km depth.

The earthquake was located by: Bollettino Sismico Italiano INGV.

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.

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Municipalities within 20 km from the epicenter

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Pomarance PI 5 5897 5897
Montecatini Val di Cecina PI 12 1749 7646
Volterra PI 12 10519 18165
Castelnuovo di Val di Cecina PI 13 2231 20396
Guardistallo PI 15 1234 21630
Montescudaio PI 15 2144 23774
Monteverdi Marittimo PI 16 758 24532
Casale Marittimo PI 16 1122 25654
Monterotondo Marittimo GR 17 1371 27025
Bibbona LI 18 3175 30200
Riparbella PI 19 1603 31803
Radicondoli SI 19 914 32717
Casole d'Elsa SI 19 3897 36614

Municipalities with at least 50000 inhabitants

An earthquake occurred to
42 Km W of Siena (53903 inhabitants)
50 Km SE of Livorno (159219 inhabitants)
57 Km SE of Pisa (89158 inhabitants)
59 Km SW of Scandicci (50609 inhabitants)
63 Km SW of Firenze (382808 inhabitants)
65 Km NW of Grosseto (82087 inhabitants)
66 Km SE of Lucca (89046 inhabitants)
69 Km SW of Prato (191150 inhabitants)
71 Km S of Pistoia (90315 inhabitants)
78 Km SE of Viareggio (62467 inhabitants)
89 Km W of Arezzo (99543 inhabitants)
98 Km SE of Massa (69479 inhabitants)
Recent and historical seismicity

These maps show the seismic activity in different time intervals, before the seismic event to which they refer. Data reported in the first two maps come from the analysis carried out in real time by the personnel of the INGV Operating Rooms, immediately after each earthquake. The third map shows data from 1985 to the date of the earthquake: the locations are reviewed by the seismological analysts of the INGV Italian Seismic Bulletin (Bollettino Sismico Italiano dell’INGV). The localization parameters (hypocentral coordinates and magnitude) are the best possible estimate with the data available to the INGV, but are constantly updated according to further data that become available. The location and magnitude parameters, subsequently reviewed by seismological analysts, may vary.

Earthquakes of the 3 days preceding this event

Earthquakes of the 3 days preceding this event

This map shows the earthquake epicenters with magnitude ≥ 0.0, localized with data recorded by the National Seismic Network and other collaborative networks both in Italy and in neighboring countries, in the 72 hours preceding this event. The size of the circle indicates the different classes of magnitude. The colors indicate the different time intervals preceding the seismic event. The black and white star is the epicenter of the current earthquake.
Earthquakes of the 90 days preceding this event

Earthquakes of the 90 days preceding this event

This map shows the earthquake epicenters with magnitude ≥ 2.0, localized with data recorded by the National Seismic Network and other collaborative networks both in Italy and in neighboring countries, in the 90 days preceding this event. The size of the circle indicates the different classes of magnitude. The colors indicate the different time intervals preceding the seismic event. The black and white star is the epicenter of the current earthquake.
Earthquakes from 1985 to the date of the event

Earthquakes from 1985 to the date of the event

This map shows the earthquake epicenters with magnitude ≥ 3.0, localized with data recorded by the National Seismic Network and other collaborative networks both in Italy and in neighboring countries, from 1985 to the date of this event. The size of the circle indicates the different classes of magnitude. The colors indicate the different time intervals preceding the seismic event. The black and white star is the epicenter of the current earthquake.
Earthquakes since 1000 AD until 2019

Earthquakes since 1000 AD until 2019

This map shows the epicenters of the historical earthquakes catalogue CPT15 (Catalogo Parametrico dei Terremoti Italiani, 2015 version 3.0, https://doi.org/10.13127/cpti/cpti15.3) since 1000 AD until 2019. The size of the square indicates the different classes of magnitude. For earthquakes with magnitude ≥ 6.0, it is also shown the year of occurrence and the magnitude value. The black and white star is 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
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Bulletin
Rev1000 		Md 3.1
ML-VAX 2.5 		1999-10-29
17:50:01		 43.299 10.813 3 2013-07-15
08:40:51		 Bollettino Sismico Italiano INGV 376319
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1999-10-29 17:50:01 ± 0.214
Latitude 43.2990 ± 0.0105
Longitude 10.8130 ± 0.0148
Depth (km) 3 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 376319

Uncertainty

Field Value
Preferred uncertainty description horizontal uncertainty
Semi-major axis of confidence ellipse (meter)
Semi-minor axis of confidence ellipse (meter)
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi)
Circular confidence region, given by single value of horizontal uncertainty (meter) 1669.6
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 154
Number of associated phases, regardless of their use for origin computation 30
Number of defining phases 30
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.3
Epicentral distance of station closest to the epicenter (degree) 0.00170
Epicentral distance of station farthest from the epicenter (degree) 0.03222
Number of stations at which the event was observed 20
Number of stations from which data was used for origin computation 20
Magnitudes information

Md:3.1

Field Value
Value 3.1
Uncertainty
Num. used stations 14
Type of magnitude Md
Reference to an origin 376319
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 22:53:20

ML:2.5

Field Value
Value 2.5
Uncertainty
Num. used stations 6
Type of magnitude ML
Reference to an origin 376319
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2015-04-28 13:07:13
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
--.PTCC.Z. 1999-10-29T17:50:58.81 10.0 undecidable manual PN 29 3.5742 1.18 0
--.MNS.Z. 1999-10-29T17:50:51.72 10.0 undecidable manual SN 123 1.6317 -1.03 0
--.ARV.Z. 1999-10-29T17:50:51.68 10.0 undecidable manual SN 82 1.554 0.96 0.1
--.ORO.Z. 1999-10-29T17:50:50.99 10.0 undecidable manual PN 320 3.0747 0.32 0.6
--.DOI.Z. 1999-10-29T17:50:47.22 10.0 undecidable manual PN 296 2.8305 -0.1 0.8
--.CTI.Z. 1999-10-29T17:50:47.00 10.0 undecidable manual PN 12 2.8083 0.04 0.8
--.GU9.Z. 1999-10-29T17:50:38.88 10.0 undecidable manual SG 351 1.0656 0.27 0.4
--.ZC9.Z. 1999-10-29T17:50:37.90 10.0 undecidable manual SG 6 1.0545 -0.57 0.2
--.CKI.Z. 1999-10-29T17:50:36.83 10.0 undecidable manual PN 302 2.1423 -0.95 0.1
--.SFI.Z. 1999-10-29T17:50:35.90 10.0 undecidable manual SG 50 0.9657 0.52 0.3
--.BOB.Z. 1999-10-29T17:50:33.17 10.0 undecidable manual PN 326 1.7649 0.57 0.5
--.CRE.Z. 1999-10-29T17:50:32.72 10.0 undecidable manual SG 68 0.8769 -0.18 0.5
--.NRCA.Z. 1999-10-29T17:50:32.40 10.0 undecidable manual PN 104 1.7316 0.11 1.1
--.MNS.Z. 1999-10-29T17:50:31.54 10.0 undecidable manual PN 123 1.6317 0.58 0.5
--.ARV.Z. 1999-10-29T17:50:29.82 10.0 positive manual PN 82 1.554 0.03 2.4
--.BDI.Z. 1999-10-29T17:50:29.70 10.0 undecidable manual SG 348 0.777 -0.41 0.4
--.SNTG.Z. 1999-10-29T17:50:28.82 10.0 undecidable manual PN 91 1.5429 -0.81 0.3
--.FB9.Z. 1999-10-29T17:50:28.89 10.0 undecidable manual PN 73 1.4763 0.24 1.1
--.ASS.Z. 1999-10-29T17:50:26.69 10.0 positive manual PN 99 1.3542 -0.36 1.9
--.ZC9.Z. 1999-10-29T17:50:23.74 10.0 undecidable manual PG 6 1.0545 1.02 0.1
--.GU9.Z. 1999-10-29T17:50:22.60 10.0 positive manual PG 351 1.0656 -0.2 2.4
--.SFI.Z. 1999-10-29T17:50:20.74 10.0 positive manual PG 50 0.9657 -0.19 2.4
--.CRE.Z. 1999-10-29T17:50:19.35 10.0 negative manual PG 68 0.8769 -0.15 2.5
--.PII.Z. 1999-10-29T17:50:19.70 10.0 undecidable manual SG 333 0.4662 -0.3 0.4
--.BDI.Z. 1999-10-29T17:50:17.35 10.0 negative manual PG 348 0.777 -0.17 2.4
--.CSNT.Z. 1999-10-29T17:50:15.30 10.0 undecidable manual SG 63 0.3885 -0.88 0.1
--.PII.Z. 1999-10-29T17:50:11.64 10.0 negative manual PG 333 0.4662 -0.05 2.6
--.CSNT.Z. 1999-10-29T17:50:09.94 10.0 positive manual PG 63 0.3885 0.1 2.6
--.GRFL.Z. 1999-10-29T17:50:08.60 10.0 undecidable manual SG 142 0.1887 -0.61 0.2
--.GRFL.Z. 1999-10-29T17:50:05.85 10.0 negative manual PG 142 0.1887 0.34 2
TDMT - Time Domain Moment Tensor
Fault Plane solutions in the area
Fault Plane solutions

Fault Plane solutions

The map reports the fault plane solutions for earthquakes in the region from 1977 to the date of this event. Red moment tensors are determined using the Regional Centroid Moment Tensor technique (RCMT, http://www.bo.ingv.it/RCMT) applied for earthquakes with magnitude larger than 4.5 in the Euro-Mediterranenan area. Occasionally, when a station azimuthal coverage exists RCMTs can be obtained also for earthquakes with magnitude down to 4.0. The gray moment tensors are obtained with the Time Domain Moment Tensor method (TDMT, /tdmt). This technique is applied to earthquakes with magnitude ML greater than 3.2, when it is possible. The size of symbols 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