diff --git a/README.md b/README.md
index 171f1b3a60d062121bc7ec073eabb244fb9e6530..efbdd99d064e5b23463ac1a2065967ebc5686306 100644
--- a/README.md
+++ b/README.md
@@ -13,8 +13,8 @@ For details on the format of this model, see the *nshmp-haz*
## Site Files
-The `map-conus.geojson` file defines the latitude-longitude range over which the USGS computes
-maps of seismic hazard from this model. The `sites-conus.geojson` and `sites-conus.csv` files
+The `map.geojson` file defines the latitude-longitude range over which the USGS computes
+maps of seismic hazard from this model. The `sites.geojson` and `sites.csv` files
contain the test sites at which the USGS performs more detailed comparisons between model editions.
See the *nshmp-haz* user guide [site specification section][5] for more details on these files.
diff --git a/active-crust/gmm-tree.json b/active-crust/gmm-tree.json
index 6a94f6772c602f54a4cfd1603e0a213c4dec4091..1129f14ee2f7b67ba682a044d819b1887a361dfc 100644
--- a/active-crust/gmm-tree.json
+++ b/active-crust/gmm-tree.json
@@ -1,6 +1,7 @@
[
{ "id": "ASK_14_BASIN", "weight": 0.25 },
- { "id": "BSSA_14_BASIN", "weight": 0.25 },
+ { "id": "BSSA_14_BASIN", "weight": 0.1875 },
+ { "id": "BSSA_14_CYBERSHAKE_CENTERED", "weight": 0.0625 },
{ "id": "CB_14_BASIN", "weight": 0.25 },
{ "id": "CY_14_BASIN", "weight": 0.25 }
]
diff --git a/site-data/README.md b/site-data/README.md
new file mode 100644
index 0000000000000000000000000000000000000000..725acdc9e52ebd7e1cc07bd64493bb1a366746b0
--- /dev/null
+++ b/site-data/README.md
@@ -0,0 +1,7 @@
+# Site Data
+
+This directory contains data and information required by GMMs to enable site or region specific
+behavior. The `basin` directory contains <i>z</i><sub>1.0</sub> and <i>z</i><sub>2.5</sub> values
+for Western U.S. basins. The `margin` directory contains sediment thickness, <i>z<sub>Sed</sub></i>
+data for the Gulf and Atlantic coastal plains. The `gmm-flag` directory defines areas over which
+region-specific behavior may be applied in a GMM.
diff --git a/site-data/gmm-flag/los-angeles-cybershake.geojson b/site-data/gmm-flag/los-angeles-cybershake.geojson
new file mode 100644
index 0000000000000000000000000000000000000000..3813b57742ee63a0d2db35e49f8a378873c57a07
--- /dev/null
+++ b/site-data/gmm-flag/los-angeles-cybershake.geojson
@@ -0,0 +1,24 @@
+{
+ "type": "Feature",
+ "geometry": {
+ "type": "Polygon",
+ "coordinates": [[
+ [-119.66000, 34.28000],
+ [-119.97172, 34.43575],
+ [-119.76298, 34.51493],
+ [-119.39952, 34.70065],
+ [-119.19960, 34.79709],
+ [-118.64526, 34.70718],
+ [-117.98979, 34.45032],
+ [-117.74823, 34.11186],
+ [-117.49204, 33.91388],
+ [-117.39105, 33.26888],
+ [-118.17976, 33.49368],
+ [-119.66000, 34.28000]
+ ]]
+ },
+ "properties": {
+ "name": "Los Angeles, CyberShake",
+ "id": "LA_CYBERSHAKE"
+ }
+}
diff --git a/site-data/gmm-flag/seattle-m9.geojson b/site-data/gmm-flag/seattle-m9.geojson
new file mode 100644
index 0000000000000000000000000000000000000000..b66a9ecc987cb9dbc39c968dbc2601243abaab00
--- /dev/null
+++ b/site-data/gmm-flag/seattle-m9.geojson
@@ -0,0 +1,91 @@
+{
+ "type": "Feature",
+ "geometry": {
+ "type": "Polygon",
+ "coordinates": [[
+ [-122.81668, 47.600582],
+ [-122.82232, 47.622847],
+ [-122.83142, 47.636651],
+ [-122.84324, 47.652848],
+ [-122.8479, 47.667883],
+ [-122.84724, 47.684156],
+ [-122.83867, 47.710118],
+ [-122.8273, 47.72766],
+ [-122.82931, 47.743914],
+ [-122.83479, 47.752917],
+ [-122.84657, 47.764891],
+ [-122.8423, 47.779375],
+ [-122.84338, 47.793222],
+ [-122.85433, 47.808814],
+ [-122.85449, 47.820257],
+ [-122.83146, 47.836662],
+ [-122.80478, 47.848869],
+ [-122.77353, 47.853267],
+ [-122.73583, 47.843842],
+ [-122.69643, 47.840438],
+ [-122.65528, 47.840042],
+ [-122.60064, 47.832467],
+ [-122.56478, 47.82419],
+ [-122.52537, 47.817122],
+ [-122.49143, 47.821466],
+ [-122.44762, 47.823425],
+ [-122.41091, 47.816315],
+ [-122.38938, 47.80614],
+ [-122.36696, 47.793554],
+ [-122.34817, 47.790592],
+ [-122.32763, 47.793053],
+ [-122.29459, 47.799755],
+ [-122.26871, 47.811252],
+ [-122.22404, 47.821573],
+ [-122.18111, 47.819831],
+ [-122.13639, 47.814463],
+ [-122.08541, 47.802459],
+ [-122.04875, 47.79525],
+ [-122.0264, 47.783812],
+ [-122.01031, 47.770562],
+ [-121.97637, 47.741044],
+ [-121.95048, 47.719952],
+ [-121.93712, 47.697053],
+ [-121.91841, 47.674147],
+ [-121.89704, 47.645812],
+ [-121.89173, 47.622909],
+ [-121.8891, 47.600609],
+ [-121.89447, 47.583136],
+ [-121.92209, 47.578333],
+ [-121.94614, 47.580153],
+ [-121.96395, 47.585583],
+ [-121.99246, 47.585588],
+ [-122.03165, 47.577749],
+ [-122.07262, 47.577733],
+ [-122.11805, 47.577098],
+ [-122.16526, 47.580062],
+ [-122.2, 47.579412],
+ [-122.24273, 47.573314],
+ [-122.26765,47.569651],
+ [-122.30598, 47.575596],
+ [-122.33714, 47.572508],
+ [-122.35495, 47.571859],
+ [-122.40489, 47.581964],
+ [-122.42092, 47.581914],
+ [-122.43784, 47.580655],
+ [-122.43791, 47.590298],
+ [-122.46554, 47.592616],
+ [-122.46561, 47.602258],
+ [-122.52451, 47.611684],
+ [-122.57982, 47.617483],
+ [-122.60567, 47.618574],
+ [-122.63595, 47.615421],
+ [-122.66531, 47.61106],
+ [-122.69378, 47.606697],
+ [-122.72141, 47.607155],
+ [-122.73565, 47.605872],
+ [-122.77839, 47.602618],
+ [-122.80421, 47.60126],
+ [-122.81667, 47.59998]
+ ]]
+ },
+ "properties": {
+ "name": "Seattle, M9",
+ "id": "SEATTLE_M9"
+ }
+}
\ No newline at end of file